Optical Drive and Library SCSI-2 Command Reference

SCSI-2 Drive Command Set
Seek (Group 0) Command (0BH)
Chapter 2 2-25
SCSI-2 Drive Commands
Seek (Group 0) Command (0BH)
This command seeks the optical head to the physical track where the
specified logical block exists.
PBA A Physical Block Address bit of 1 indicates that physical
block addressing is used.
A PBA bit of 0 indicates that logical block addressing is
used.
NOTE When this command is used with 512 byte/sector 4X/ 8X/14X media, 1024
byte/sector 8X/14X media, or 2048 14X media, it is not possible to address
all logical blocks on the disk because those media types contain >2
21
logical blocks.
NOTE When this command is used with 14X 512 or 1024 byte/sector media,
setting the PBA bit will cause the drive to return a CHECK CONDITION
status. The sense key/additional sense code will be set to ILLEGAL
REQUEST/INVALID FIELD in CDB.
Table 2-19 Seek (Group 0) Command CDB
Byte 7 6 5 4 3 2 1 0
0 Operation Code (0BH)
1 Logical Unit Number
(0)
Logical Block Address (MSByte)
2 Logical Block Address
3 Logical Block Address (LSByte)
4 Reserved (0)
5 PBA Reserved (0) Flag Link