Seagate STT8000A manual Appendix a Glossary

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Appendix A

Glossary

Dew— Collection of moisture in a tape drive.

Directory track—The track at the centerline of the tape, identified as track 254 by its Track ID frame.

Disc Drive— A peripheral storage device that rotates the disk, writes data onto it, and reads data from it as instructed by a program.

ECC—(Error Correction Code) Special drive generated information that can be used to correct bad blocks.

ECC block— A block containing drive-generated ECC data in its data field and part of control field.

Encoding— A method whereby a group of data bits is translated into a group of recording bits.

End-of-Data (EOD)— Indicates the point where the host stopped writing data to the tape.

End-of-Media (EOM)— Equal to the physical end of tape.

End-of-Partition(EOP)—The position at the end of the permissible recording area of a partition.

End of Tape (EOT)— Equal to the logical end of the tape.

Error Correction Codes (ECC)- Information written on tape during the recording operation that can later be used to reconstruct errors during the data reading operation.

Early Warning (EW)— The early warning marker is a single hole punched in the tape to indicate the approaching end of the usable recording area in the forward direction.

File— A logical unit of information.

Filler block— A block containing no valid information in its data field.

Fixed Disk— A non-removable hard disk. All data must be transferred to and from the disk via the computer.

Frame— A group of 128 blocks forming a complete logical group.

Full-high (or full-height)—Usually refers to a tape drive fitting in a vertical space of 3-1/2 inches.

Half-high (or half-height)—Refers to the size of tape drive occupying a vertical space of about 1-1/2 inches.

Head Clog— Particles from the tape or from outside the drive adhere to the head gap on a read or write head and obstruct the reading or writing of data.

Interleaving— The process of shuffling the order of data blocks before writing them to tape so the consecutive bytes are not recorded physically adjacent.

Magnetic Tape— A tape that accepts and retains magnetic signals intended for input, output, and storage of data for information processing.

Media Header block—A unique block identifying the type of format being recorded.

Noise— A disturbance of the signal caused by the read channel, write channel, head/tape interaction, or conducted or radiated sources.

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STT8000A Product Manual

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Contents STT8000A Atapi Minicartridge Drive Product Manual Page FCC Notice Important Information About This Manual Table of Contents Atapi interface Tape format Glossary Acronyms and measurements Introduction Drive overviewSTT8000A internal drive without mounting brackets Features Typical system configurations Minicartridge technology overviewSoftware Flash EepromReferences About this manual Chapter Title DescriptionPhysical specifications SpecificationsOverview STT8000A 3.5-Inch mount general dimensions Power specifications Specification MeasurementPerformance specifications Feature SpecificationSpecification Operational Non-operational Environmental requirementsMean-Time-Between Failures ReliabilityMean-Time-To-Repair Recommended tapes Tape capacities and formatsRegulatory compliance TUV & IEC-RHEINLANDBefore you begin InstallationIntroduction Handling guidelinesSetting jumpers Jumper block and jumper settingsInstalling the drive Aligning the drive in the computerMounting dimensions Mounting holes on internal drive without mounting brackets ATA-2 Interface pin assignments Pin Assignment Description SourceREQ Chapter Installation Drive operation and maintenance Front panel LEDUsing Travan cartridges Loading and unloading cartridgesSetting the write-protect switch Travan cartridge write-protect switch-locked positionLoading revised firmware via Seagate firmware cartridge Caring for tape cartridges Care and maintenance of the drive and cartridgesCaring for the drive Capstan Tape Head Troubleshooting Chapter Atapi interface ATA-2 SignalsATA-2 Interface ATA registers AbrtBits Mnemonic Description Supported ATA Commands Previous Cmd Int ReasonFeature Number Set Feature Commands Atapi Identify Device A1h Atapi Packet Command A0h Atapi interface DSCErase command Inquiry command Bit ByteLoad/Unload command Locate command Log Select command Log Sense command Error Counter Page Read Following table presents the Error Counter Page layoutTape Capacity Page Code Following table presents the Tape Capacity Page layoutMode Select command Mode Sense command Code DescriptionMode Parameter Header Mode Block DescriptorMode Medium Partition Mode Capabilities and Mechanical StatusMode Tape Parameters Read command Read Position command Following table describes the Read Position layoutChapter Atapi Interface Request Sense command Following table describes the Request Sense layout Rewind command Space command Test Unit Ready command Write command Write Filemark command Write Buffer download microcode command Tape partitioning Tape formatTrack positions Track format Track numberingFrames General track layout Tape reference servo pattern BlocksWrite equalization RandomizationChapter Tape format Block diagram Theory of operationsCartridge load mechanism Capstan drive motor assemblyMechanics ChassisControl circuits Sensors and switchesHead design Media-Travan minicartridges Travan minicartridgeGlossary Appendix a Glossary Glossary Appendix a Glossary Acronyms and measurements Acronyms and abbreviationsLSI Units of measurement Measure MeaningAppendix B Acronyms and Measurements
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