Read Defect Data (B7) - IBM Ultrastar 36LZX Specifications

8.19 READ DEFECT DATA (B7)

Byte
7 6
0
1 Reserved = 0
2
3
4
5
6 (MSB)
|
9
10
11 VU = 0
Figure 121. Read Defect Data (B7)
The READ DEFECT DATA command requests that the Target transfer the medium defect data to the
initiator.
If the target is unable to access any medium defect data it will return a Check Condition status with the
appropriate sense key. The sense key will be set to either Medium Error (03h) if a medium error occurred
or to No Sense (00h) if the list does not exist and the additional sense code will be set to Defect List
Error (19h).
Plist The Primary Defect List (Plist) bit set to one indicates that the target returns the primary list of
defects. A Plist bit of zero indicates that the target shall not return the Primary Defect list of
defects.
Glist The Grown Defect List (Glist) bit set to one indicates that the target returns the grown defect list.
A Glist bit of zero indicates that the target shall not return the Grown Defect list of defects.
Note: With both bits set to one Plist and Glist the target will return both the Primary and Grown
defect lists. With both bits set to zero the target will return only a four-byte Defect List Header.
Defect List format
The Defect List Format Field is used by the initiator to indicate the preferred format for the defect
list.
The Defect List Format of '100 (Bytes from Index Format)' and '101 (Physical Sector Format)' are sup-
ported. If the requested format is not supported by the drive, it will return the defect list in its default
format '101' and then terminate the command with Check Condition status. The sense key will be set to
Recovered Error (01h) and the additional sense code will be set to Defect List Not Found (1Ch).
The drive sends defect list (Defect Descriptors) in a four byte ABA (Absolute Block Address) format
which follows a four byte Defect List Header.
The target will transfer all of the Read Defect Data up to the number of bytes allocated by the initiator.
Bit
5 4 3
Command Code = B7h
Plist Glist
Reserved = 0
Allocation Length
Reserved = 0
Reserved = 0
Ultrastar 36LZX hard disk drive specifications
2 1 0
Defect List Format
(LSB)
FLAG LINK
148