Read Defect Data - HP C2488A Technical Reference Manual

Read Defect Data
The READ DEFECT DATA command requests that the Target transfer the media defect
data to the Initiator.
Read Defect Data Command Descriptor Block (COB)
Bit
Byte
7
I
6
J
5 4
1
-3
1
2
I
1
I
0
00 Opcode = 37H
01
Logical Unit Number Reserved
02 Reserved PLIST
I
GLIST
I
Defect List Fonnat
03-06 Reserved
07-08 (MSB=07) Allocation Length (LSB=08)
09 Control Byte
PLIST (Primary Defed List), GLIST (Grown Defect List). A PLIST bit of one (1) indicates
the Initiator requests a primary list of defects be returned. A GLIST bit of one (1) indicates
that the Initiator requests the grown list of defects. If both bits are one (1), the combination
of both lists is requested. If both bits are zero (0), only the header will be returned.
Defect List Format. This field indicates the preferred format for the returned defect list.
The bit states are as defined by the FORMAT UNIT command. The Target will return the
list in the physical sector format (5) or bytes from index (4) format. If any other format is
requested, the list will be returned in the bytes from index format and the target will return:
Status: CHECK CONDITION
Sense Key RECOVERED ERROR
Additional Sense Code DEFECT LIST NOT FOUND
Allocation Length. This field specifies the number of bytes that the Initiator has allocated
for returned data. An Allocation Length of zero indicates that no data should be transferred
and should not be considered an error. Any other value indicates the maximum number of
bytes that shall be transferred. The Target shall terminate the data phase when either the
allocation length or all available READ DEFECT DATA has been sent, whichever is less.
A-34 SCSI Command Descriptions DRAFT
1/18/93
09:58