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SCSI Description

Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives 5–155

5.28 REASSIGN BLOCKS Command (07h)

The REASSIGN BLOCKS Command reassigns one or more logical blocks to a spare

location(s) set aside for this purpose and records the reassignments in the Grown

Defect List.

No command-specific Control Descriptor Block fields affect the processing performed

for this command.

The list of Logical Block Addresses to reassign is supplied in the REASSIGN

BLOCKS Defect List passed in the command's data-out buffer transfer. The Defect

List consists of a Defect List Header (Figure 5–73) followed by zero or more Defect

Descriptors (Figure 5-74). Table 5–73 contains the field description for the Defect

List Header. If multiple Logical Block Addresses are specified, they are listed in

ascending order.

The REASSIGN BLOCKS Command Descriptor Block is shown in Figure 5-72.

Bit

Byte

7 6 5 4 3 2 1 0

0 Operation Code (07h)

1 - 4 Reserved

5 Control

Figure 5–72 REASSIGN BLOCKS Command Descriptor Block — Data Format

Bit

Byte

7 6 5 4 3 2 1 0

0 - 1 Reserved

2 - 3 Defect List Length

Figure 5–73 REASSIGN BLOCKS Defect List Header — Data Format

Table 5–73 REASSIGN BLOCKS Defect List Header — Field Description

Field Description

Defect List Length The contents of this field indirectly indicates the number of defective

Logical Block Addresses passed in the Defect List. The value must be four

times the number of Defect Descriptors supplied. Zero (0) is a valid value

and makes the command a NOP.

1 2 ... 217 218 219 220 221 222 223 224 225 226 227 ... 370 371

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Quantum 10K II Manuel d'utilisateur Page 222