Maxtor 10K III 132, Read Capacity Command-Data Format, Read Capacity Command-Field Descriptions

SCSI Description

￿￿￿￿4'#&The￿%#2#%+6;READ CAPACITY￿%QOOCPFcommand￿￿￿￿reportsJ￿formatted capacity and track-boundary information. The data format and field descriptions are shown in Table 5-131and Table 5-132respectively.

READ CAPACITY Command-Data Format

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Table5-

131

Operation￿

Code￿(25h)

￿

￿

￿

￿

￿

￿

1

Reserved

RelAdr

- 5

Logical Block Address

- 7

Reserved

8

Reserved

PMI

9

Control

READ CAPACITY Command-Field Descriptions

Table5-132

beRelative0.

Addressing is not&GUETKRVKQPsupported by the drive; the field must

RelAdr(KGNF￿

Logical Block Address

Used in conjunction with the PMI bit. Must be 0 when the PMI bit

is 0.

Partial Media Indicator. When the value in the field is 0, the Re-

turned Logical Block Address (Table 5-133) is that of the last log-

ical 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 Ad-

PMI

dress 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 encoun-

tered).

In either case, Block Length in Bytes (Table 5-133)is the unit's

logical sector size, as determined by the Block Length field in the

Mode parameter Block Descriptor.

Table 5-133shows the READ CAPACITY Returned Data - Data Format that will

be sent during the data-in buffer transfer for the command. Refer to the PMI

description in Table 5-132for a description of these data fields.

READ CAPACITY Returned Data-Data Format

0 - 3

Returned Logical Block Address

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￿￿

￿

Block￿Length in ￿Bytes

￿

￿

￿

5-110

Maxtor

TableAtlas 10K5-133III