Optical Drive and Library SCSI-2 Command Reference

SCSI-2 Drive Command Set
Read Defect Data (Group 5) Command (B7H)
Chapter 2 2-143
SCSI-2 Drive Commands
Defect List
Format This field specifies the Defect List Format that is
returned. Only the Physical Sector Format (5) is
supported. If the Block Format (0) is specified, the
defect list will be returned in Physical Sector Format
and a CHECK CONDITION status will be returned at
the completion of the command with the sense key/
additional sense code set to RECOVERED ERROR/
Defect List Not Available.
Allocation
Length Specifies the number of bytes that the initiator has
allocated for return of this data. A length of 0 indicates
that no data will be returned. This condition is not
considered an error. The drive will terminate the data
— in phase when the allocation length has been
transferred or when all defect data has been transferred
to the initiator, whichever is less.
PList A primary List bit of 1 indicates that the Primary List
of defects was returned.
GList A Grown List bit of 1 indicates that the Grown List of
defects was returned.
Table 2-128 Read Defect Data Defect List Header
Byte 7 6 5 4 3 2 1 0
0 Reserved (0)
1 Reserved (0) PList GList Defect List Format
2 Reserved (0)
3 Reserved (0)
4 Defect List Length (MSByte)
5 Defect List Length
6 Defect List Length
7 Defect List Length (LSByte)