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SCSI Description
Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives
5–141
5.23
READ CAPACITY Command (25h)
The READ CAPACITY command reports formatted capacity and track-boundary
information.
Bit
Byte
7
6
5
4
3
2
1
0
0
Operation Code (25h)
1
Reserved
RelAdr
2 - 5
Logical Block Address
6 - 7
Reserved
8
Reserved
PMI
9
Control
Figure 5–59 READ CAPACITY Command — Data Format
Table 5–66 READ CAPACITY Command — Field Descriptions
Field
Description
RelAdr
Relative Addressing is not supported by the drive; the field must be 0.
Logical Block Address
Used in conjunction with the PMI bit. Must be 0 when the PMI bit is 0.
PMI
Partial Media Indicator. When the value in the field is 0, the Returned
Logical Block Address (Figure 5-60) is that of the last logical sector of the
logical unit.
When the value is 1, the Returned Logical Block Address is that of the last
sector on the same cylinder as the Logical Block Address supplied in the
Command Descriptor Block's LBA field. That is, the Returned Logical Block
Address is that of the Logical Block Address before a substantial delay in
data transfer will be encountered).
In either case, Block Length in Bytes (Figure 5-60) is the unit's logical
sector size, as determined by the Block Length field in the Mode
parameter Block Descriptor.
Summary of Contents for Quantum Atlas 10K II 9.2/18.4/36.7/73.4 GB
Page 15: ...Contents Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives xv...
Page 19: ...Contents Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives xix...
Page 25: ...About This Manual 1 4 Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives...
Page 55: ...Installation 3 28 Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives...
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Page 315: ...Feature Descriptions 6 14 Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives...
Page 321: ...Appendix A Quick Reference A 6 Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives...
Page 363: ...Appendix B SCSI Bus Signal Timing B 42 Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives...
Page 369: ...Index I 4 Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives...
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