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Chapter 6 Tape format
Page 66 STT8000A Product Manual
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 byte of the block.
The Data Field of the blocks always contain 512 bytes. However, the number of
valid data bytes in the block may be less than 512.
The seven different types of blocks are as follows:
•
Data blocks
contain user data. A full Data block contains 512 bytes; however,
data block can contain from 1 through 511 valid data bytes depending on the
selected logical block size of the host.
•
Media Header blocks
contain specific host., drive, and vendor information as
well as the Volume Directory. The first frame on the Directory Track is teh Media
Header Frame. This frame contains 52 Media Header blocks (plus the normal
12 ECC blocks).
•
Information blocks
—Filemark blocks, Setmark blocks, and Cancelmark
blocks—contain specific types of information. Filemark blocks are physical
blocks written to tape in response to a host WRITE FILEMARKS command.
Setmark blocks are physical blocks written to tape in response to a host WRITE
SETMARKS command. Cancelmark blocks are physical blocks written to tape
under firmware control.
•
Filler blocks
contain no valid information in the data area. These blocks are
used to fill incomplete frames.
•
EOD
blocks
are absolute indicators of the end of recorded data.
•
ECC blocks
contain error correction parity bytes that are used to ensure data
integrity during read operations.
•
Track ID
blocks are recorded as part of the pre-formatting process of the
cartridge.
Tape reference servo pattern
To increase track density, a track servo reference pattern is prerecorded on the tape
at the factory. The pattern is recorded referenced to servo patterns in the region
between the beginning-of-tape (BOT) hole and the load point market (LP) hole. The
same pattern is recorded between the end-of-tape (EOT) hole and the early warning
(EW) hole. The servo pattern is written across the entire width of the tape.
- STT8000A 1
- ATAPI Minicartridge Drive 1
- Product Manual 1
- Technology, Inc 2
- FCC Notice 3
- Table of Contents 5
- ATAPI interface 31 6
- Tape format 63 7
- Theory of operations 69 7
- Glossary 73 8
- Acronyms and measurements 77 8
- Introduction 9
- Figure 1-1 10
- Features 11
- Typical system configurations 12
- Flash EEPROM 13
- Software 13
- References 13
- About this manual 14
- Specifications 15
- Figure 2-1 16
- Figure 2-2 16
- Power specifications 17
- Performance specifications 18
- Environmental requirements 19
- Mean-Time-Between Failures 20
- Mean-Time-To-Repair 20
- Recommended tapes 21
- Tape capacities and formats 21
- Regulatory compliance 22
- Installation 23
- Handling guidelines 23
- Setting jumpers 24
- Installing the drive 25
- Mounting dimensions 26
- Figure 3-4 27
- Figure 3-5 27
- Chapter 3 Installation 28
- Installation Chapter 3 29
- DRIVE ACTIVE 31
- Using Travan cartridges 32
- Figure 4-4 33
- Figure 4-5 33
- Caring for tape cartridges 35
- Caring for the drive 35
- Capstan Tape Head 36
- Troubleshooting 37
- ATAPI interface 39
- ATA-2 Signals 39
- ATA registers 40
- ATAPI Interface Chapter 5 41
- Supported ATA Commands 42
- Chapter 5 ATAPI Interface 44
- Erase command 47
- Inquiry command 48
- Load/Unload command 49
- Locate command 50
- Log Select command 51
- Log Sense command 52
- Error Counter Page (Read) 53
- Tape Capacity Page Code 54
- Mode Select command 55
- Mode Sense command 56
- Mode Parameter Header 57
- Mode Block Descriptor 57
- Mode Medium Partition Page 58
- Mode Tape Parameters Page 59
- Read command 60
- Read Position command 61
- Request Sense command 63
- Rewind command 65
- Space command 66
- Test Unit Ready command 67
- Write command 68
- Write Filemark command 69
- Tape format 71
- Track numbering 72
- Track format 72
- Figure 6-1 73
- General track layout 73
- Figure 6-2 73
- General frame layout 73
- Tape reference servo pattern 74
- Write equalization 75
- Randomization 75
- Chapter 6 Tape format 76
- Overview 77
- Block diagram 77
- Cartridge load mechanism 78
- Capstan drive motor assembly 78
- Control circuits 79
- Head design 79
- Sensors and switches 79
- Media—Travan minicartridges 80
- Glossary 81
- Appendix A Glossary 82
- Glossary Appendix A 83
- Acronyms and measurements 85
- Units of measurement 87
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