HP C2488A Technical Reference Manual page 91

Read Defect Data
Read Defect Data Defect List Header Format
Bit
Byte
7
I
6
I
5
I
"
I
3
I
2
I
1
I
0
00 Reserved
01 Reserved
I
PLIST
I
GLIST
I
Defect List Format
02-03
(MSB=02) Defect List Length
(LSB=03)
..
Defect List Descriptor Format
Bit
Byte
7
I
6
I
5
I
4
I
3
I
2
I
1
1
0
00-02
(MSB=OO)
Cylinder Number Of Defect
(LSB=02)
03
Head Number of Defect
04-07
(MSB=04)
Sector Number Of Defect (Physical Sector Format) (LSB=07)
.
Byte Index of Defect (Bytes from Index Format)
The data returned by the READ DEFECT DATA command contains a four-byte Header,
followed by zero or more Defect Descriptors
Defed List Length. This Header field specifies the total length of the following Defect
Descriptors in bytes. If the Allocation Length field of the CDB is less than the length of the
available defect list data, the Defect List Length is NOT adjusted to reflect the truncation.
The defect descriptors are in ascending address order. Ascending address order for physical
sector format is defined as cylinder most-significant and sector least-significant. A sector
number of all ones (FFFFFFFFH) indicates that the entire track has been spared.
The defect data is supplied in such a manner that the list can be issued in a FORMAT
command to restore the current media reassignment mapping without re-ordering. If the list
cannot be read from the media, the Target will return:
DRAFT
1/18/93 09:58
Status: CHECK CONDITION
Sense Key: MEDIUM ERROR
Additional Sense Code: DEFECT LIST ERROR
SCSI Command Descriptions A-35