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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.

1 2 ... 203 204 205 206 207 208 209 210 211 212 213 ... 370 371

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