Optical Drive and Library SCSI-2 Command Reference

SCSI-2 Drive Command Set
Mode Sense (Group 0) Command (1AH)
Chapter 22-54
Mode Sense (Group 0) Command (1AH)
This command is used to acquire optical disk, drive, and drive controller
parameters.
DBD A Disable Block Descriptors bit of 1 indicates that no
block descriptor is provided.
A DBD bit of 0 indicates that the block descriptor is
provided.
PC Page control defines the type of parameter values to be
returned as follows:
00 - Current Values
01 - Changeable Values
10 - Default Values
11 - Saved Values
Page Code Page code values are the same as for the Mode Select
command. If 00H or 3FH is specified, all pages are
returned.
Table 2-47 Mode Sense (Group 0) Command CDB
Byte 7 6 5 4 3 2 1 0
0 Operation Code (1AH)
1 Logical Unit Number
(0)
Rsvd
(0)
DBD Rsvd (0)
2 PC Page Code (Table 2-50 on page 2-56)
3 Reserved (0)
4 Allocation Length
5 Reserved (0) Flag Link