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Quantum Audio STT3401A manuel d'utilisation

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Table des matières du manuel d’utilisation

  • Page 1

    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . STT2401A, STT3401A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Travan 40 tape drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pr[...]

  • Page 2

    © 2002 Seagate Removable Storage Solutions LLC. All rights reserved Part Number 100249522 Seagate and the Seagate logo are registered trademarks of Seagate Technology LLC. Other product names are trademarks or registered trademarks of their owners. Seagate reserves the right to change, without notice, p roduct offerings or specifications. No part [...]

  • Page 3

    FCC Notice This equipment generates and uses r adio frequency energy and, if not installed and used properly — that is, in strict accordance with the manufacturer’s instructions — may cause interference to radio communications or radio and television reception. It has been tested and found to comply with t he limits for a Class B computing de[...]

  • Page 4

    Table of Contents Page iv Seagate Travan 40 Product Manual Table of Contents Introduction 1 Drive overview .............................................................................................................. 1 Key features .......................................................................................................... 1 Typical [...]

  • Page 5

    Table of Contents Seagate Travan 40 Product Manual Page v Manual ejection ............................................................................................. 18 Setting the write - protect switch ........................................................................... 19 Drive maintenance ...............................................[...]

  • Page 6

    Table of Contents Page vi Seagate Travan 40 Product Manual Page 31h — Sp ecial Information Definitions .................................................. 46 Page 33h — Special Information in STT31401A mode ........................................ 47 Page 33h — Special Information Definitions .................................................. [...]

  • Page 7

    Table of Contents Seagate Travan 40 Product Manual Page vii Tape partitioning ...................................................................................................... 114 Track positions ........................................................................................................ 114 Track numbering ........................[...]

  • Page 8

    [...]

  • Page 9

    Introduction Chapter 1 Seagate Travan 40 Product Manual Page 1 Introduction Drive overview The Seagate® STT3401A and STT2401A extend the Seagate family of one - inch high Travan drives that feature high performance, high re liability, and quiet operation. The drives transfer data at up to 120 megabytes per minute (Mbytes/min) without compression. [...]

  • Page 10

    Chapter 1 Introduction Page 2 Seagate Travan 40 Product Manual W ith the availability of greate r capacity disc drives and the growth of small networks, the need for cost - effective, high - capacity storage has grown. The STT3401A is ideal for standalone computers, workstations, and small networks. Figure 1 shows the STT3401A 3.5 - inch internal d[...]

  • Page 11

    Introduction Chapter 1 Seagate Travan 40 Product Manual Page 3 Figure 3 Sample ATAPI configurations Minicartridge technology overview Having evolved from the original mass - storage medium — reel - to - reel, one - half - inch tape storage — the minicartridge technology of today offers fast, e fficient, high - capacity storage in a compact, eas[...]

  • Page 12

    Chapter 1 Introduction Page 4 Seagate Travan 40 Product Manual Flash EEPROM The Seagate Travan drives incorporate leading - edge technology in the flash EEPROM, which is useful should the drive's firmware need to be upgraded. W ith th e permanently installed, electrically upgradeable, flash EEPROM memory, revised firmware for the drive can be [...]

  • Page 13

    Specifications Chapter 2 Seagate Travan 40 Product Manual Page 5 Specifications Performance specifications The following table lists the performance specifications for the Seagate STT2401A and STT3401A tape drives. Feature Specification Capacity 20.0 Gbytes — Travan 40 cartridge (native) (40.0 Gbytes, assuming 2:1 compression) Sustained backup ra[...]

  • Page 14

    Chapter 2 Specifications Page 6 Seagate Travan 40 Product Manual Physical specifications The physical specifications of the STT3401A and STT2401A are listed in the following table. Specification Drive for 3.5 - inch mount Drive for 5.2 5 - inch mount Height 1.0 in / 25.4 mm 1.625 in (max) / 41.3 mm including bezel Width 4.0 in / 101.6 mm 5.875 in /[...]

  • Page 15

    Specifications Chapter 2 Seagate Travan 40 Product Manual Page 7 Figure 5 STT2401A (5.25 - inch mount) general dimensions Power supply specifications The following table lists the power supply requirements for the Travan 40 drives. Power specifications are measured at the tape drive power connector and are nominal values. Current and power requirem[...]

  • Page 16

    Chapter 2 Specifications Page 8 Seagate Travan 40 Product Manual Power use Seek Load/unload Capstan startup Standby 9.6 watts 9.6 watts 38 watts 0.4 watts 4.0 watts 3.0 watts 6.0 watts 2.3 watts Power connector The following table lists pin assignment s for the power connector for the drive. Pin Assignment 1 +12V DC 2 +12 return 3 +5 return 4 +5V D[...]

  • Page 17

    Specifications Chapter 2 Seagate Travan 40 Product Manual Page 9 Shock (1/2 sine wave) 7Gs peak, 11 msec (retries may be occur) 50 Gs peak, 11 msec Aco ustic level operational (A - wt sum) 55 dBA maximum (measured at operator position, per ISO 7779) — Shock (1/2 sine wave) 2.5 Gs peak, 11 msec 100 Gs peak, 11 msec Reliability The STT3401A is desi[...]

  • Page 18

    Chapter 2 Specifications Page 10 Seagate Travan 40 Product Manual be returned to the factory in its original packaging. Contact your distributor, dealer, your computer system company, or your Seagate sales representative to arrange th e return. Tape compatibility The table below summarizes the types of tape cartridges that can be used with the Seag[...]

  • Page 19

    Specifications Chapter 2 Seagate Travan 40 Product Manual Page 11 • Install the drive in an enclosure that limits the user's access t o live parts, gives adequate system stability, and provides the necessary grounding for the drive. • Provide the correct voltages (+5V DC and +12V DC) based on the regulation applied — Extra Low Voltage (S[...]

  • Page 20

    Chapter 4 Drive operation and maintenance Page 12 Seagate Travan 40 Product Manual Before installing the Seagate Travan 40 drive make sure that the jumpers are properly co nfigured for your system. Figure 6 shows the location of the jumper block, as well as master/slave jumper settings for various configurations. Note: Record your jumper settings p[...]

  • Page 21

    Drive operation and maintenance Chapter 4 Seagate Travan 40 Product Manual Page 13 Installing the drive The STT3401A can be installed in a one - half - inch high by 3.5 - inch form factor drive bay or in a one - inch high by 5.25 - inch form factor (with mounting b rackets). The drive can be installed in three different orientations: horizontally ([...]

  • Page 22

    Chapter 4 Drive operation and maintenance Page 14 Seagate Travan 40 Product Manual 6. Secure the drive using the mounting screws. The threaded mounting brackets are designed for M3.0 metric screws. If you are mounting the drive in a 3.5 - inch bay, use the screw supplied with the drive. Do not substitute other screws. Using longer screws may damage[...]

  • Page 23

    Drive operation and maintenance Chapter 4 Seagate Travan 40 Product Manual Page 15 Figure 8 Mounting holes on STT3401A (withou t mounting brackets) Figure 9 Mounting holes on STT2401A (with mounting bracket[...]

  • Page 24

    Chapter 4 Drive operation and maintenance Page 16 Seagate Travan 40 Product Manual Drive operation and maintenance Introduction This chapter describes important operational procedures for the STT3401A and STT2401A. It covers the following topics: • The fro nt panel LED (Drive Activity Light/Eject Button) • Using Travan 40 cartridges • Drive m[...]

  • Page 25

    Drive operation and maintenance Chapter 4 Seagate Travan 40 Product Manual Page 17 Using Travan cartridges The minicartridges recommended for use with the Travan 40 drive are li sted in Chapter 2. This section describes some operations using the cartridges. Loading cartridges Your tape drive has a flip - up door that covers the cartridge opening wh[...]

  • Page 26

    Chapter 4 Drive operation and maintenance Page 18 Seagate Travan 40 Product Manual Figure 12 Unloading a Tape cartridge After removing the cartridge from the drive, place the cartridge in its protective case and store it in a cool, dry location. Emergency cartridge removal Forcing cartridge ejection If the drive will not eject a cartridge during no[...]

  • Page 27

    Drive operation and maintenance Chapter 4 Seagate Travan 40 Product Manual Page 19 Caut ion. After using the emergency ejection procedure to remove a cartridge, you must restart the drive before inserting a new cartridge. Power must be reapplied to the drive before it will move the loading mechanism into position for inserting a new cartridge . Set[...]

  • Page 28

    Chapter 4 Drive operation and maintenance Page 20 Seagate Travan 40 Product Manual Drive maintenance Mini mal maintenance is needed to ensure that your Travan 40 drive operates at peak condition. This section explains how to care for tape cartridges, how to clean the drive head, and what to do if you experience problems with the drive. Caring for t[...]

  • Page 29

    Drive operation and maintenance Chapter 4 Seagate Travan 40 Product Manual Page 21 the drive immediately if you ob serve an increase in the number of errors while running your backup software, or if a TapeAlert cleaning message is displayed. W ith the newer generation of Travan tape drive heads used in these drives, only the dry - process cleaning [...]

  • Page 30

    Chapter 4 Drive operation and maintenance Page 22 Seagate Travan 40 Product Manual 1 DRAM Write Miscompare 2 DRAM Write Timed Out 3 DRAM Read Timed Out 4 DMA Timed Out 5 ATAPI Interface Failed 6 SRAM Self Test Failed 7 DRAM/SRAM Self Test Failed 8 Serial ASIC Failed 9 Buff er Manager ASIC Failed 11 Stepper Motor Test Failed 12 Transport Motor Test [...]

  • Page 31

    Drive operation and maintenance Chapter 4 Seagate Travan 40 Product Manual Page 23 Drive n ot seen during boot - up • Ensure that 5/12 volt power is plugged into tape drive. Insert tape: – If soft load receives tape and tape movement back and forth occurs — power is OK. – If no tape movement occurs — power down system and use power plug f[...]

  • Page 32

    Chapter 4 Drive operation and maintenance Page 24 Seagate Travan 40 Product Manual • Hard disc problems can also cause system lock up. Run a hard disc diagnostic utility such as CHKDSK or SCANDISK and repair any error it might find. • Not enough system res ources or a misbehaving memory resident program may cause erratic system behavior. In som[...]

  • Page 33

    Drive operation and maintenance Chapter 4 Seagate Travan 40 Product Manual Page 25 • Use Stdiag to perform a write/read test. Retension the tape with Stdiag program. The Stdiag write/read test will overwrite data on the tape. Set “Te st Size” to minimum of 100MB. – If test write/read fails — replace tape with new tape and retry backup. ?[...]

  • Page 34

    Chapter 4 Drive operation and maintenance Page 26 Seagate Travan 40 Product Manual If after a repeat loading of the firmware cartridge the same condition is observed, contact your Seagate sales representative. Firmware upgrade cartridges are available to qualified Seagate OEM customers . Contact your Seagate sales representative for information.[...]

  • Page 35

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 27 ATAPI interface Introduction The Seagate Travan 40 drives come with an ATA Packet Interface (ATAPI) controller for communications between the host computer and the drive. The drive supports the QIC - 157 standard interface. Note: Refer to the QIC - 157 Standard for detailed informa[...]

  • Page 36

    Chapter 5 ATAPI Interface Page 28 Seagate Travan 40 Product Manual Pin Assignment Description Source 21 DMARQ DMA Request Device 22 GND Ground N/A 23 DIOW - I/O Write Host 24 – REQ Ground N/A 25 – I/O I/O Read Host 26 GND Ground N/A 27 IORDY I/O Ready Device 28 CSEL Cable Select Device 29 DMACK DMA Acknowledge Host 30 GND Ground N/A 31 INTRQ In[...]

  • Page 37

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 29 Op Code (Hex) Command See Page 15 MODE SELECT 51 17 RELEASE UNIT 72 19 ERASE 29 1A MODE SENSE 61 1B LOAD / UNLOAD 33 1D SEND DIAGNOSTIC 81 1E PREVENT/ALLO W MEDIA REMOVAL 66 2B LOCATE 35 34 READ POSITION 71 3B WRITE BUFFER 87 3C READ BUFFER 69 4C LOG SELECT 36 4D LOG SENSE 37 Speci[...]

  • Page 38

    Chapter 5 ATAPI Interface Page 30 Seagate Travan 40 Product Manual ERASE (Group 0, Op. Code 19) The ERASE command will erase the entire tape if the tape is positioned at BOT. Both the Directory and the Data Partitions will be erased. If the drive is in the Directory Partition when the ERASE command is received, the drive will remain in the Director[...]

  • Page 39

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 31 INQUIRY (Group 0, Op. Code 12) The INQUIRY command allows the Host to determine the configuration of the tape drive connected to the bus. CDB for INQUIRY Command Data Bits Byte 7 6 5 4 3 2 1 0 Hex 0 0 0 0 1 0 0 1 0 12 1 0 0 0 0 0 0 0 0 00 2 0 0 0 0 0 0 0 0 00 3 0 0 0 0 0 0 0 0 00 4[...]

  • Page 40

    Chapter 5 ATAPI Interface Page 32 Seagate Travan 40 Product Manual ANSI Version: This field indicates the ANSI compliance level. A value of 001b indicates compliance with SCSI Standard X3.131 - 1986. A value of 010b indicates compliance with QIC - 121 (SCSI - 2). TrmIOP: Terminate I/O message is supported. The Term I/O bit shall be set to 1. Respon[...]

  • Page 41

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 33 LOAD/UNLOAD (Group 0, Op. Code 1B) This command has three functions. • To position (LOAD) a tape cartridge to BOT • To eject (UNLOAD) a cartridge • To retension the installed cartridge in conjunction with a Load/Unload operation Not e. The Imation Travan Mini Cartridge specif[...]

  • Page 42

    Chapter 5 ATAPI Interface Page 34 Seagate Travan 40 Product Manual LOAD/UNLOAD Command (EOT, RET and LOA Bits) Initial State EOT RET LOA Action Final State Loaded, Ready 0 0 0 Position to BOT and set Unload status Unloaded, Not Ready Loaded, Ready 0 0 1 Position to BOT Ready Loaded, Ready 0 1 0 Retension, Position to BOT and set Unload status Unloa[...]

  • Page 43

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 35 LOCATE (Group 1, Op. Code 2B) The LOCATE command causes the target to position the logical unit to the specified block address in a specified partition. Upon completion, the logical position will be before the specified location so that the specified block will be the next to be re[...]

  • Page 44

    Chapter 5 ATAPI Interface Page 36 Seagate Travan 40 Product Manual LOG SELECT (G roup 2, Code 4C) The LOG SELECT command provides a means for the Initiator to manage statistical information maintained by the tape drive about itself. CDB for LOG SELECT Command Data Bits Byte 7 6 5 4 3 2 1 0 Hex 0 0 1 0 0 1 1 0 0 4C 1 0 0 0 0 0 0 PC R SP 0X 2 PC 0 0 [...]

  • Page 45

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 37 LOG SENSE (Group 2, Op. Code 4D) The LOG SENSE command provides a means for the Initiator to retrieve statistical information maintained by the tape drive about the tape drive. CDB for LOG SENSE Co mmand Data Bits Byte 7 6 5 4 3 2 1 0 Hex 0 0 1 0 0 1 1 0 1 4D 1 0 0 0 0 0 0 PPC SP 0[...]

  • Page 46

    Chapter 5 ATAPI Interface Page 38 Seagate Travan 40 Product Manual Page 00h — Supported Log Page Data Bits Byte 7 6 5 4 3 2 1 0 Hex 0 0 0 Page Code 00 1 0 0 0 0 0 0 0 0 00 2 3 MSB Additional Page Length LSB 00 09 4 5 6 7 8 9 10 11 Supported Page List 03 2E 31 33 3E Supported Log Page: The Supported Log Page provides a list of supported log pages [...]

  • Page 47

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 39 D Parameter Code LSB 01 E DU DS TSD ETC TMC 0 LP 40 F Parameter Length 04 10 11 12 13 MSB Total Errors Corrected LSB XX XX XX XX NOTE: (Total Blocks Recovered by ECC) + Total Errors Corrected = Total Blocks Read Page 03 — Error Counter for READ definitions Byte 00 Page Code Set t[...]

  • Page 48

    Chapter 5 ATAPI Interface Page 40 Seagate Travan 40 Product Manual Note: Fields marked with (*) will reset on power cycle, SCSI reset, cartridge insertion, rewind, or PCR. Page 2Eh — TapeAlert Diagnostic Data Bits Byte 7 6 5 4 3 2 1 0 Hex 0 0 0 Page Code 2E 1 Reserved 00 2 3 MSB Page Length LSB 00 140 Ta peAlert Flags 5n - 1 5n MSB Parameter Code[...]

  • Page 49

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 41 • Drive hardware defects • Worn out media or wrong media • Expired cleaning tapes • Abno rmal error conditions The TapeAlert information is accessed via a Log Sense page, and configuration is via a MODE SELECT page. The Mode Sense/Select configuration of the TapeAlert inter[...]

  • Page 50

    Chapter 5 ATAPI Interface Page 42 Seagate Travan 40 Product Manual NOTE: When a flag is cleared by reading th e TapeAlert Log page, a flag cannot be set again until the error condition is removed (e.g., the specified corrective action has been taken). So, for example, if the cartridge in the drive is not data grade, once flag 8 has been cleared by [...]

  • Page 51

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 43 No. Flag Type Required Host Message Cause supplier helpline. 7 Media Life W The tape cartri dge has reached the end of its calculated useful life: 1. Copy any data you need to another tape 2. Discard the old tape. The media has exceeded its specified life. 9 Write Protect C You are[...]

  • Page 52

    Chapter 5 ATAPI Interface Page 44 Seagate Travan 40 Product Manual No. Flag Type Required Host Message Cause 3. Restart the operation. 31 Hardware B C The tape drive has a hardware fault: 1. Turn the tape drive off and on again. 2. Restart the operation. 3. If the problem persists, call the tape drive supplier helpline. Check the tape drive users m[...]

  • Page 53

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 45 Page 31h — Tape Capacity Page Data Bits Byte 7 6 5 4 3 2 1 0 Hex 0 0 0 Page Code 31 1 0 0 0 0 0 0 0 0 00 2 3 MSB Additional Page Length LSB 00 20 4 5 MSB Parameter Code LSB 00 01 6 DU DS TSD ETC TMC 0 LP 40 7 Parameter Length 04 8 9 A B MSB Remaining Capacity Data Partition LSB X[...]

  • Page 54

    Chapter 5 ATAPI Interface Page 46 Seagate Travan 40 Product Manual Page 31h — Special Information Data Bi ts Byte 7 6 5 4 3 2 1 0 Hex 0 0 0 Page Code 31 1 0 0 0 0 0 0 0 0 00 2 3 MSB Additional Page Length LSB 00 1F 4 5 MSB Parameter Code LSB 00 00 6 DU DS TSD ETC TMC 0 LP E1 7 Parameter Length 06 8 D MSB Unit Serial Number LSB XX XX Page 31h — [...]

  • Page 55

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 47 Page 33h — Speci al Information in STT31401A mode Data Bits Byte 7 6 5 4 3 2 1 0 Hex 0 0 0 Page Code 33 1 0 0 0 0 0 0 0 0 00 2 3 MSB Additional Page Length LSB 00 140 4 5 MSB Parameter Code LSB 00 00 6 DU DS TSD ETC TMC 0 LP 40 7 Parameter Length 0C 8 13 MSB Unit Serial Number LS[...]

  • Page 56

    Chapter 5 ATAPI Interface Page 48 Seagate Travan 40 Product Manual Data Bits Byte 7 6 5 4 3 2 1 0 Hex 34 Parameter Length 04 35 38 MSB Longest Time Between Cleanings (in Minutes) LSB XX XX XX XX 39 3A MSB Parameter Code LSB 00 06 3B DU DS TSD ETC TMC 0 LP 40 3C Parameter Length 02 3D 3E MSB Cleaning Interval (in Minutes) LSB XX XX Page 33h — Spec[...]

  • Page 57

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 49 1F - 22 Tape Moved The length of tape (estimated in feet) passed over the head since the last head cleaning. The field is incremented by 740 feet at EOT and BOT when tape motion is reversed. It is only incremented when the full length of the tape has been traversed a nd the directi[...]

  • Page 58

    Chapter 5 ATAPI Interface Page 50 Seagate Travan 40 Product Manual follows. 6 DU The Disable Update bit must be set to 0, indicating the drive updates parameter values for all events. DS The Disable Save bit is always set to 1, indicating the drive does not save parameter values. TSD The Target Save Disable bit is always set to 0 indicating the dri[...]

  • Page 59

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 51 MODE SELECT (Group 0, Op. Code 15) The Host issues the MODE SELECT command to establish certain drive parameters. These parameters are sent to the drive as data. The parameters established by this command are not unique to the Initiator issuing the command. If a second Initiator ch[...]

  • Page 60

    Chapter 5 ATAPI Interface Page 52 Seagate Travan 40 Product Manual cause of the error. While writing, the drive will re vert to Unbuffered Mode when Logical Early Warning (LE W) is reached. A RE W IND issued at this point will cause the drive to rewind to BOT and return to Buffered Mode. Speed Code: The values of speed codes are given in the table [...]

  • Page 61

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 53 Page Code 01h — Error Recovery and Reporting Parameters Data Bits Byte 7 6 5 4 3 2 1 0 H ex 0 0 0 Page Code 01 1 Additional Page Length 0A 2 0 0 TB 0 EER PER DTE DCR X8 3 Read Retry Count 10 4 0 0 0 0 0 0 0 0 00 5 0 0 0 0 0 0 0 0 00 6 0 0 0 0 0 0 0 0 00 7 0 0 0 0 0 0 0 0 00 8 Wri[...]

  • Page 62

    Chapter 5 ATAPI Interface Page 54 Seagate Travan 40 Product Manual Page Code 10h — Device Configuration Parameters Data Bits Byte 7 6 5 4 3 2 1 0 Hex 0 0 0 Page Code (10h) 10 1 Additional Page Length 0E 2 0 CAP CAF Active Format X0 3 Active Partition XX 4 Write Buffer Full Ratio XX 5 Read Buffer Empty Ratio XX 6 7 MSB Write Delay Time LSB 00 00 8[...]

  • Page 63

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 55 Write Delay Time: This field indicates the maximum time, in 100 millisecond increments, that the drive shall retain buffered data without subsequent write or sync hronizing commands before forcing it to the media. Filler blocks containing invalid filler data required to fill out EC[...]

  • Page 64

    Chapter 5 ATAPI Interface Page 56 Seagate Travan 40 Product Manual EEG: Enable EOD Generation — When set to 1, this bit indicates that the logical unit shall generate the appropriate EOD area, as determined by the EOD Defined fi eld. A value of 0 indicates that EOD generation is disabled. 1 is the value supported. This field is non - changeable. [...]

  • Page 65

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 57 Media Format Recognition field is intended for use by the MODE SENSE command, in which it is set to 03h, indicating that the drive is capable of recognizi ng the format and partition of the tape automatically. This is per QIC - 157D, table 5 - 45. This field is ignored in MODE SELE[...]

  • Page 66

    Chapter 5 ATAPI Interface Page 58 Seagate Travan 40 Product Manual reported in the method specified by the MRIE value, except with the additional Sense Code set to 0x5DFF. If both the Test and Dexcpt bits are set to 1 and Test Flag Number set to 0, then the MODE SELECT command will return Check Condition , with Sense Key set to Il legal Request and[...]

  • Page 67

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 59 MRIE (Default set to 0x3): This field indicates the method used by the target to report informational exception conditions (note that this is standard SCSI terminology and is not related in any way to the “Information” severity level for t he flags). The priority of reporting i[...]

  • Page 68

    Chapter 5 ATAPI Interface Page 60 Seagate Travan 40 Product Manual 0×6: Only report informational exception condition on request . Th is method instructs the device server to preserve information exception(s) information. To find out about information exception conditions the application client polls the device server by issuing an unsolicited REQ[...]

  • Page 69

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 61 MODE SENSE (Group 0, Op. Code 1A) The MODE SENSE command provides t he Host with information pertaining to the configuration of the drive. The drive does not disconnect from the Initiator while executing this command. CDB for MODE SENSE Command Data Bits Byte 7 6 5 4 3 2 1 0 Hex 0 [...]

  • Page 70

    Chapter 5 ATAPI Interface Page 62 Seagate Travan 40 Product Manual Page Code Description 20h Forced Streaming Page Will Be Returned 2Ah Capabilities and Mechan ical Status Page 3Fh All Pages (01h through 3Fh) Will Be Returned Refer to MODE SELECT command for a description of the Parameter Pages. Allocation Length: This field specifies the number of[...]

  • Page 71

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 63 Speed Code: Speed code values are listed in the table below. The Speed C ode may be set explicitly by MODE SELECT command, or implicitly when AVC ( Auto - Throttle) is set to 1 (bit 4, byte 8 of page code 10h). If AVC is set to 1, MODE SENSE will report the actual speed selected to[...]

  • Page 72

    Chapter 5 ATAPI Interface Page 64 Seagate Travan 40 Product Manual Page Code 2A Capabilities and Mechanical Status Page Data Bits Byte 7 6 5 4 3 2 1 0 Hex 0 0 0 Page Code (2A) 2A 1 Page Length (12h) 12 2 Reserved XX 3 Reserved XX 4 Rsvd Rsvd Rsvd SPREV Rsvd Rsvd Rsvd RO 1 20 or 21 5 Rsvd Rsvd QFA Rsvd EFMT Rsvd Rsvd Rsvd 28 6 CMPRS ECC Rsvd DIS - C[...]

  • Page 73

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 65 PREVENT: If the PREVENT bit is set, the device de faults to the Prevent state after power - up. LOCKED: If the LOCKED bit is set, the volume is locked. LOCK: If the LOCK bit is set, the device supports locking the volume using the PREVENT/ALLO W MEDIA REMOVAL command. BLK1024: If t[...]

  • Page 74

    Chapter 5 ATAPI Interface Page 66 Seagate Travan 40 Product Manual PREVENT/ALLOW MEDIA REMOVAL (Group 0, Op. Code 1E) This command is used to prevent or allow the removal of the tape cartridge. CDB for PREVENT/ALLOW MEDIA REMOVAL Command Data Bits Byte 7 6 5 4 3 2 1 0 Hex 0 0 0 0 1 1 1 1 0 1E 1 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 00 3 0 0 0 0 0 0 [...]

  • Page 75

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 67 READ (Group 0, Op. Code 08) The READ command transfers the specified amount of data from the tape drive to the Initiator. The command terminates when one of the following conditions occurs: • The Transfer length specified in the CDB has been satisfied. • A Filemark or Setmark h[...]

  • Page 76

    Chapter 5 ATAPI Interface Page 68 Seagate Travan 40 Product Manual READ process (e.g., RE W IND). S ee REQUEST SENSE, bytes 14 - 15 and LOG SENSE, Page 3. Data Under - Run Counter: This counter is incremented each time a buffer overrun causes the tape to reposition. The counter is cleared when the READ process is terminated. See REQUEST SENSE, byte[...]

  • Page 77

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 69 READ BUFFER (Group 1, Op. Code 3C) The READ BUFFER command will cause the contents of the drive’s data buffer to be returned to the Host and is intended to be used in conjunction with the WRITE BUFFER command as a Diagnostic tool. Using Buffer I.D. and Bu ffer Offset, the data tr[...]

  • Page 78

    Chapter 5 ATAPI Interface Page 70 Seagate Travan 40 Product Manual READ BUFFER Header (Mode 00h) Data Bits Byte 7 6 5 4 3 2 1 0 Hex 0 0 0 0 0 0 0 0 0 00 1 2 3 MSB Buffer Capacity LSB XX XX XX Buffer Capacity: This field specifies the total number of bytes in the drive’s buffer.[...]

  • Page 79

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 71 READ POSITION (Group 1, Op. Code 34) The READ POSITION command reports the current position of the logic al unit and any data blocks in the buffer. No tape movement shall occur as a result of the command. The drive may disconnect during this command. CDB for READ POSITION Command D[...]

  • Page 80

    Chapter 5 ATAPI Interface Page 72 Seagate Travan 40 Product Manual BOP: The Beginning Of Partition bit, if set to 1, indicates that the lo gical unit is at the beginning - of - partition in the current partition. EOP: The End Of Partition bit, if set to 1, indicates that the logical unit is at the end - of - partition in the current partition. BPU:[...]

  • Page 81

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 73 REQUEST SENSE (Group 0, Op. Code 03) Information pertinent to the completion of a command is obtained by the REQUEST SENSE command. Although a REQUEST SENSE command may be issued at any time, it is typically issued immediately following a command that has resulted in a Check Condit[...]

  • Page 82

    Chapter 5 ATAPI Interface Page 74 Seagate Travan 40 Product Manual Data Bits Byte 7 6 5 4 3 2 1 0 Hex 11 Field Pointer LSB XX 12 0 CNI 0 WP PEO M UDE BNL FIL XX 13 0 0 NDT 0 BOM BPE 0 0 XX 14 15 MSB Data Error Counter LSB XX XX 16 17 MSB Data Overrun/Under - run Counter LSB XX XX 18 Track Number XX 19 Cartrid ge Type XX 1A 1B MSB Filemark Count LSB[...]

  • Page 83

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 75 Command Specific Information: This field contains information that depends on the command that was last executed. Further meaning for this field is defined within the command description. Additional Sense Code & Qualifier: S pecifies detailed information related to the addition[...]

  • Page 84

    Chapter 5 ATAPI Interface Page 76 Seagate Travan 40 Product Manual Code Travan 7 Compatibility Cartridge Type 00h N/A No cartridge, cleaning cartridge, or type unknown 85h Read / Write Travan 5, NS20 95h N/A Travan 7 Filemark Count: This is the number of Filemarks encou ntered since the tape was last at BOM. This counter is not reset by a REQUEST S[...]

  • Page 85

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 77 Sense Key (hex value) Type Meaning not the same as the physical EOM. 9 Vendor Unique This Sense Key is available for reporting vendor unique conditions (Not Used). A Copy Aborted A COPY command was aborted due to an error on the source or destination device (Not Supported). B Abort[...]

  • Page 86

    Chapter 5 ATAPI Interface Page 78 Seagate Travan 40 Product Manual Sense Key ASC ASCQ Meaning 04 44 00 Hardware error occurred 04 44 81 Fan error 04 47 00 SCSI parity error non - command state 04 47 00 SCSI parity error in command state 05 00 00 Attempted to erase tape when not at BOT 05 20 00 Invalid CDB opco de 05 21 00 Invalid LBA 05 22 00 Inval[...]

  • Page 87

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 79 Sense Key ASC ASCQ Meaning 0D 00 00 Physical end of medium detected[...]

  • Page 88

    Chapter 5 ATAPI Interface Page 80 Seagate Travan 40 Product Manual REWIND (Group 0, Op Code 01) When operating in single partition mode, the RE W IND command causes the drive to rewind the tape to the physical Beginning - Of - Partition (BOP) or load point. CDB for REWIND command Data Bits Byte 7 6 5 4 3 2 1 0 Hex 0 0 0 0 0 0 0 0 1 01 1 0 0 0 0 0 0[...]

  • Page 89

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 81 SEND DI AGNOSTIC (Group 0, Code 1D) The SEND DIAGNOSTIC command requests the target to perform diagnostic tests on it. Except when the Self - Test bit is one, this command is usually followed by a Receive Diagnostic Results command. CDB for SEND DIAGNOSTIC command Data Bits Byte 7 [...]

  • Page 90

    Chapter 5 ATAPI Interface Page 82 Seagate Travan 40 Product Manual SPACE (Group 0, Op. Code 11) The SPACE command provides a means of positioning the tape forward or reverse of the current position. The command can space over data blocks, filemarks, sequential filemarks, or to the End - of - Data. CDB for SPACE command Data Bits Byte 7 6 5 4 3 2 1 [...]

  • Page 91

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 83 If Logical Early Warning is encountered, the command continues to normal completion, then reports Check Co ndition with No Sense and EOM set in the Sense Data. NOTE: If RSMK is set in Mode Data Page 10h, Byte 8, Bit 5, Set Marks will be treated as Filemarks when spacing over data. [...]

  • Page 92

    Chapter 5 ATAPI Interface Page 84 Seagate Travan 40 Product Manual TEST UNIT READY (Group 0, Op Code 00) This command performs a test to ensure that the tape drive is ready and a tape cartridge is installe d. TEST UNIT READY does not initiate the internal diagnostic self - test. The drive does not disconnect during execution of this command. CDB fo[...]

  • Page 93

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 85 VERIFY (Group 0, Op. Code 13) The VERIFY command performs a Verification Check on a specified number of data blocks on the tape without involving the Host. Verification s tarts at the present position of the tape and continues for the specified number of blocks. If a data block can[...]

  • Page 94

    Chapter 5 ATAPI Interface Page 86 Seagate Travan 40 Product Manual WRITE (Group 0, Op. Cod e 0A) The WRITE command transfers the specified amount of data from the Initiator to the tape drive. A rewind or other Write process terminating command (e.g., WRITE FILEMARK with length set to 0) must be issued after the last write command to allow the dr iv[...]

  • Page 95

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 87 WRITE BUFFER (Group 1, Op. Code 3B) T he WRITE BUFFER command is used in conjunction with the READ BUFFER command as a diagnostic tool or for downloading firmware. This command tests the ATAPI Bus and the drive’s Data Buffer. The tape is not affected. Using Buffer ID and Buffer O[...]

  • Page 96

    Chapter 5 ATAPI Interface Page 88 Seagate Travan 40 Product Manual Buffer Offs et: This field specifies where the first data byte received from the Host is to be placed in the Buffer specified by the Buffer ID field. Values greater than 07FFh will give Check Condition , Illegal Request. Transfer Length: This field specifies the number of bytes to b[...]

  • Page 97

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 89 WRITE FILEMARK (Group 0, Op. Code 10) This command writes a specified number of Filemark blocks to the tape. CDB for WRITE FILEMARK command Data Bits Byte 7 6 5 4 3 2 1 0 Hex 0 0 0 0 1 0 0 0 0 10 1 0 0 0 0 0 0 WSMK IMM 00 2 3 4 MSB Transfer Length LSB XX XX XX 5 0 0 0 0 0 0 0 0 00 [...]

  • Page 98

    Chapter 5 ATAPI Interface Page 90 Seagate Travan 40 Product Manual be avoided by simply insuring the cartridge is removed from the drive following any WRITE or WRITE FILEMARK operations[...]

  • Page 99

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 91 ATA Command Descriptions The following ATA commands are supported. Ge neral Feature Set • EXECUTE DEVICE DIAGNOSTIC • IDENTIFY DEVICE • NOP • SET FEATURES ATAPI Feature Set • ATAPI ‘DEVICE’ RESET • IDENTIFY PACKET DEVICE • PACKET Power Management Feature Set • C[...]

  • Page 100

    Chapter 5 ATAPI Interface Page 92 Seagate Travan 40 Product Manual Opcode (Hex) Command Ref. page E3 IDLE 105 E5 CHECK PO WER MODE 93 E6 SLEEP 111 EC IDENTIFY DEVICE 97 EF SET FEATURES 109[...]

  • Page 101

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 93 CHECK POWER MODE (ATA Command E5) The CHECK PO WER MODE command allows the Host to determine the power mode of the selected device. The device does not disconnect from the bus while executing this command . Host Taskfile Registers — Inputs Data Bits Host Taskfile Register 7 6 5 4[...]

  • Page 102

    Chapter 5 ATAPI Interface Page 94 Seagate Travan 40 Product Manual DEVICE RESET (ATA Command 08) The Device Res et command enables the Host to reset an individual device without affecting the other device on the same IDE cable. This command shall be accepted when BSY or DRQ is set to one, DRDY is cleared to 0, or DMARQ is asserted. This command sha[...]

  • Page 103

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 95 EXECUTE DEVICE DIAGNOSTIC (ATA Command 9 0) This command shall perform the internal diagnostic tests implemented by the device. The DEV bit in the Device/Head register is ignored. Both devices, if present, shall execute this command regardless of which device is selected. If the Ho[...]

  • Page 104

    Chapter 5 ATAPI Interface Page 96 Seagate Travan 40 Product Manual Diagnostic Code: When this code is in the Error register of Device 0: Code (hex) Device 0 Meaning Device 1 Meaning 00, 02 - 7F Failed. Bits 6:1 cont ain an error code Passed or is not present 01 Passed Passed or is not present 81 Passed Failed. See the Error register of Device 1 for[...]

  • Page 105

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 97 IDENTIFY DEVICE (ATA Command EC) This command allows an A TA (not ATAPI) device to report its capabilities to the Host. Since this device supports the PACKET feature set, this command will be aborted. Host Taskfile Registers — Inputs Data Bits Host Taskfile Register 7 6 5 4 3 2 1[...]

  • Page 106

    Chapter 5 ATAPI Interface Page 98 Seagate Travan 40 Product Manual IDENTIFY PACKET DEVICE (ATA Command A1) This command allows an ATAPI (not ATA) device to report its capabilities to the Host. The data returned are very extensive and detailed. Please refer to the ATA - 4 document for complete details. Many details that are not relevant to this devi[...]

  • Page 107

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 99 Host Taskfile Registers — Outputs Data Bits Host Taskfile Register 7 6 5 4 3 2 1 0 HEX Error rsvd tag type (not supported) MCH ABRT EOM ILI 00 Sector Count N/A N/A Sector Number N/A N/A Byte Count High residual byte count (15 : 8) 00 Byte Count Low residual byte count ( 7 : 0) 00[...]

  • Page 108

    Chapter 5 ATAPI Interface Page 100 Seagate Travan 40 Product Manual Word(s) Starting Offset (hex) Description of Contents Value (hex) 49 62 Capabilities: 15 1=interleaved DMA support 14 1=command queuing supported 13 1=overlap operation supported 12 1=ATA software reset required (obsolete) 11 1=IORD Y supported (must be set if device supports PIO m[...]

  • Page 109

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 101 Word(s) Starting Offset (hex) Description of Contents Value (hex) 71 8E 15 - 0 typical time (3 sigma) from receipt of Packet command to release (nanosecs) (not supported) 0000 72 90 15 - 0 typical time (3 sigma) from receipt of Service command to BSY cleared to 0 (nanosecs) (not s[...]

  • Page 110

    Chapter 5 ATAPI Interface Page 102 Seagate Travan 40 Product Manual Word(s) Starting Offset (hex) Description of Contents Value (hex) 85 AA Command and feature sets enabled. If words 82 and 83=0000h or FFFFh, then command set notification is not enabled. 15 1=IDENTI FY DEVICE DMA command is enabled 14 1=NOP command is enabled 13 1=READ BUFFER comma[...]

  • Page 111

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 103 Word(s) Starting Offset (hex) Description of Contents Value (hex) 93 Hardware reset result. The contents of bits 12 - 0 of this word shall change only during the execution of a hardware reset. 15 Shall be clear ed to zero. 14 Shall be set to one. 13 1 = device detected CBLID - abo[...]

  • Page 112

    Chapter 5 ATAPI Interface Page 104 Seagate Travan 40 Product Manual Word(s) Starting Offset (hex) Description of Contents Value (hex) 160 CFA power mode 1 15 Word 160 supported 14 Reserved 13 CFA power mode 1 is required for one or more commands implemented by the device 12 CFA power mode 1 disabled 11 - 0 Maximum current in ma 161 - 175 Reserved f[...]

  • Page 113

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 105 IDLE (ATA Command E3) This command i s accepted but performs no function. This command normally allows the Host to place the device in Idle mode using the standby timer. INTRQ is asserted even though the device may not have fully transitioned to Idle mode. If the Sector Count regi[...]

  • Page 114

    Chapter 5 ATAPI Interface Page 106 Seagate Travan 40 Product Manual IDLE IMMEDIATE (ATA Command E1) This command is accepted but performs no function. This command allows the Host to immediately place the device in Idle mode. INTRQ is asserted even though the device may not have fully transitioned to Idle mode. Host Taskfile Registers — Inputs Da[...]

  • Page 115

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 107 NOP (ATA Command 00) This command allows a Host that only performs 16 - bit register accesses, to check device status. If this command is supported, the drive shall respond, as it does to an unrecognized command by setting the ABRT bit to 1 in the Error register, setting the Error[...]

  • Page 116

    Chapter 5 ATAPI Interface Page 108 Seagate Travan 40 Product Manual PACKET (ATA Command A0) The PACKET command is used to transfer a device command via a command packet. See the section ATAPI Packet Protocol , above for details.[...]

  • Page 117

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 109 SET FEATURES (ATA Command EF) This command is used by the Host to establish parameters that affect the execution of certain device features. At power on, or after a hardware reset, the default setting of the functions specified by the subcommands are vendor specific. If any subcom[...]

  • Page 118

    Chapter 5 ATAPI Interface Page 110 Seagate Travan 40 Product Manual Host Taskfile Register 7 6 5 4 3 2 1 0 HEX Error rsvd tag type (not supported) MCH ABRT EOM ILI 00 Sector Count N/A N/A Sector Number N/A N/A Byte Count High N/A Byte Count Low N/A Devi ce/Head rsvd LBA rsvd DEV SAM LUN (not used) Status BSY RDY rsvd DSC DRQ Corr rsvd CHK 40 or 50[...]

  • Page 119

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 111 SLEEP (ATA Command E6) This command provides the only way for the device to enter Sleep mode. It causes the device to set the BSY bit to one, prepare to en ter Sleep mode, clear the BSY bit to 0 and assert INTRQ. The Host shall read the Status register in order to clear the interr[...]

  • Page 120

    Chapter 5 ATAPI Interface Page 112 Seagate Travan 40 Product Manual STANDBY (ATA Command E2) This command is accepted but performs no function. This command causes the device to enter the Standby mode. I f the Sector Count register is non - 0, then the Standby timer shall be enabled. The value in the Sector Count register shall be used to determine[...]

  • Page 121

    ATAPI Interface Chapte r 5 Seagate Travan 40 Product Manual Page 113 STANDBY IMMEDIATE (ATA Command E0) This command is accepted but performs no function. This command causes the device to immediately e nter the Standby mode. Host Taskfile Registers — Inputs Data Bits Host Taskfile Register 7 6 5 4 3 2 1 0 HEX Features N/A N/A Sector Count N/A N/[...]

  • Page 122

    Chapter 6 Travan 40 tape format Page 114 Seagate Travan 40 Product Manual Travan 40 tape format Introduction The Seagate Travan 40 drives conform to the Travan 640 and the QIC - 3220 - MC recording format standa rds. These formats are for streaming magnetic tape in a minicartridge that is to be used for information interchange among information pro[...]

  • Page 123

    Travan 40 tape format Chapter 6 Seagate Travan 40 Product Manual Page 115 The tracks an d bands are arranged to allow approximately constant distance between all sequential tracks. Band 1 is located nearest the bottom edge of tape. Band 2 is located above band 1. Continuing up sequentially is band 3 and band 4 (nearest the top edge of tape). The di[...]

  • Page 124

    Chapter 6 Travan 40 tape format Page 116 Seagate Travan 40 Product Manual Frames are numbered indirectly using the 26 most significant bits of the Physical Block Address. Frame operation is controlled by the drive and gener ally invisible to the host. Frames are used primarily as a means to control the error correction operations. Frames can be ove[...]

  • Page 125

    Travan 40 tape format Chapter 6 Seagate Travan 40 Product Manual Page 117 Blocks Information in the Block Control byte determines the type of block being recorded except for ECC blocks, which are recognized by their block numbers. Also, information about the number of user data bytes available in each data block is recorded in the Block Control byt[...]

  • Page 126

    Chapter 6 Travan 40 tape format Page 118 Seagate Travan 40 Product Manual Write equalization The drive uses the technique of write equali zation. Write equalization inserts short pulses in the write current to break up the long spacing intervals. These pulses are too short to be detected in the read process but result in significant improvement in [...]

  • Page 127

    Theory of operations Chapter 7 Seagate Travan 40 Product Manual Page 119 Theory of operations Overview The Seagate Travan 40 drives provide a low - cost, high - performance minicartridge backup system that is ideal for stand - alone users or small network computer systems. W ith capacitie s of 20.0 Gbytes to 40.0 Gbytes dependent upon media and dat[...]

  • Page 128

    Chapter 7 Theory of operations Page 120 Seagate Travan 40 Product Manual Drive mechanisms This section generally describes the hardw are design features of the Seagate Travan 40 drive. You may want to refer to the block diagrams referenced previously as you read this information. Mechanics The mechanical package for the Travan 40 drive was designed[...]

  • Page 129

    Theory of operations Chapter 7 Seagate Travan 40 Product Manual Page 121 The 8 - Mbyte DRAM data buffer allows the drive to maintain streaming when the host cannot provide data continuously at the tape - streaming rate. The write driver receives data from the write formatter and generates write current, causing data to be wr itten on tape by the ta[...]

  • Page 130

    Chapter 7 Theory of operations Page 122 Seagate Travan 40 Product Manual Drive media (Travan minicartridge s) The drive is designed to use Travan 40 cartridges. These small (approximately 2 inches by 3 inches by 0.4 inch) cartridges house 1650 - Oersted Gamma Ferric Oxide magnetic tape. Figure 19 shows a Travan minicartridge. Figure 19 Travan minic[...]

  • Page 131

    Glossary Appendix A Seagate Travan 40 Product Manual Page 123 Glossary This section defines some of the acronyms and technical terms used in this manual. ABRT Status register bit: command has been aborted ANSI American National Standards Institute ATA AT (bus) Attachment ATA - 1 The first defined standard for ATA devices. ATA - 2 Revision 2 of ATA [...]

  • Page 132

    Appendix A Glossary Page 124 Seagate Travan 40 Product Manual BSY Status register bit: device is busy BUFFER Intermediate storage space used to hold data bet ween two processes that proceed at different rates. BUFFER OVERRUN A condition developed when the Host is unable to receive data at the rate required by the tape streaming operation when readi[...]

  • Page 133

    Glossary Appendix A Seagate Travan 40 Product Manual Page 125 (slave). 0=select drive 0 (master) DIRECTORY A table of contents to the various f iles stored on a computer device (such as a tape or hard disc). DIRECTORY TRACK The track at the centerline of a tape, identified as track 254 by its Track ID frame. DMA Direct Memory Access. The ability to[...]

  • Page 134

    Appendix A Glossary Page 126 Seagate Travan 40 Product Manual FCC (US) Federal Communications Commission FILE MARK An identification block written on tape in response to a command to “Write Filemarks.” FLUX TRANSITION A point on the magnetic tape which exhibits maximum free space flux density normal to the tape surface. FLUX TRANSITION SPACING [...]

  • Page 135

    Glossary Appendix A Seagate Travan 40 Product Manual Page 127 MASTER Device address 0 on an IDE bus Mbyte or MEGABYTE A megabyte is one million (1,000,000) bytes. MTBF Mean Time Between Failures MTTR Mean Time to Repair MULTI - WORD DMA An ATA protocol for DMA that transfers more than one word (2 - bytes) during each timing cycle. NIBBLE A group of[...]

  • Page 136

    Appendix A Glossary Page 128 Seagate Travan 40 Product Manual RAM Stands for Random Access Memory. It is the memory that the computer uses to hold the operating system and programs, from which all the operations are performed. Most RAMs are volatile, meaning that it is erased when the power is removed from the computer. RANDOMIZING A re - coding of[...]

  • Page 137

    Glossary Appendix A Seagate Travan 40 Product Manual Page 129 UL Underwriter's Laboratories, Inc. UDMA See ULTRA DMA. ULTRA DMA An ATA proto col for DMA transfers that can achieve data rates up to 33.3 MB/sec. ULTRA SCSI A SCSI protocol for high speed data transfers ULTRA33 See ULTRA DMA. UNCORRECTED BIT ERROR RATE The probability of a bit bei[...]