Seagate MEDALIST 1080SL Product Manual page 69

Medalist 1080sl SCSI Product Manual, August 1995
This command can be used in conjunction with the Format Unit com-
mand. Read Defect Data reads the defect lists off the reserved cylinders
or flash memory and resends the lists as defect data but does not change
the lists.
The Read Defect Data command can be used to access two types of
defect lists: the primary defect list (PList) and the grown defect list (GList) .
These lists are described in Section 3.4.4.1.
Bytes
7 6
0 0 0
1 LUN
2 0 0
3 0 0
4 0 0
5 0 0
6 0 0
7–8
9 0 0
Byte 2 If the PList bit is 1, the drive sends the primary defect list. If
the PList bit is 0, the drive does not send the primary defect
list.
If the GList bit is 1, the drive sends the grown defect list. If
the GList bit is 0, the drive does not send the grown defect
list.
If both the PList and GList bits are zero, the drive returns
the defect list header only.
If the defect list format field contains 100
the defect data in the bytes-from-index format. If the defect
list format field contains 101
data in the physical sector format. If the defect list format
field contains 000
default format, which is the physical sector format, and
generates a check condition status.
Bytes 7–8 The allocation length specifies the number of bytes the
initiator has allocated for the returned defect data. An
allocation length of 0 indicates that no defect data is trans-
ferred. The data-in phase ends when the allocation length
bytes have been transferred or when all available defect
data has been transferred to the initiator, whichever is less.
Bits
5 4 3 2
1 1 0 1
0 0 0
0 PList GList Defect list format
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
Allocation length
0 0 0 0
, the drive returns the defect
H
, the drive returns the defect data in the
H
59
1 0
1 1
0 0
0 0
0 0
0 0
0 0
0 0
, the drive returns
H