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SCSI Description

Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives 5–147

5.25 READ DEFECT DATA Command (12) (B7h)

The READ DEFECT DATA (12) command directs the drive to report defect

information about the drive’s medium. Refer to the FORMAT UNIT command for

information about defects. The data sent to the host in the command’s data-in buffer

transfer consists of a four-byte Defect List header (Figure 5-68), followed by any

Defect Descriptors (Figures 5-66 and 5-67).

The READ DEFECT DATA (12) Command Descriptor Block is shown in Figure 5-

65; the data fields are described in Table 5-69.

Bit

Byte

7 6 5 4 3 2 1 0

0 Operation Code (B7h)

1 Reserved Plist Glist Defect List Format

2 - 5 Reserved

6 - 9

(MSB)

Allocation Length

(LSB)

10 Reserved

11 Control

Figure 5–65 READ DEFECT DATA (12) Command — Data Format

Table 5–69 READ DEFECT DATA (12) Command — Field Description

Field Description

PList When the value is 0, the returned data does not include the Primary Defect

List.

When the value is 1, the returned data includes the Primary Defect List. The

defects are returned in ascending order.

GList When the value is 0, the returned data does not include the Grown Defect

List.

When the value is 1, the returned data includes the Grown Defect List. The

defects are returned in order of occurance.

When both PList and GList are set to 1, the Primary Defect List and the

Grown Defect List are returned. The Plist is returned followed by the Glist

(the lists are not merged). When both are set to 0, only the Defect List

Header (Figure 5-68) is reported to the initiator.

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Quantum 10K II Bedienungsanleitung Seite 214