Commands
96
MODE SENSE
1Ah/5Ah
M
ODE SENSE
allows the drive to return its current configuration and report which configuration
parameters can be changed through
MODE SELECT.
The mode sense header, block descriptor (optional), and zero or more of the are sent to the host.
Mode pages contain drive configuration parameters. Some of these parameters are fixed, others
are configurable (through the
MODE SELECT
command). The host should use
MODE SENSE
to
determine which drive parameters are configurable and what their current values are before using
mode select to alter them.
NOTE:
See
MODE SELECT
on page 71 for full descriptions of the Mode Parameters.If a
M
ODE
SENSE
command is issued whilst an immediate reported Load command is executing or close
to completing then the values of some parameters in some mode pages which depend on the
results of the load may be undefined.
Similarly, the write-protect field in the Mode Parameter Header will be unstable unless a
cartridge is present and medium removal is prevented.
Pre-execution checks:
The page code field must contain a valid mode page code or the value 0 or the value 3Fh. If it
does not then
CHECK CONDITION
status is reported. Sense data will be as described in the Illegal
Field Checks.
Command descriptor block:
6-Byte Version
Illegal Field
Reservation
Deferred Error
Unit Attention
7
6
5
4
3
2
1
0
0
Operation Code (1Ah)
1
Reserved (0)
DBD
Reserved (0)
2
PC
Page Code
3
Sub Page Code
4
Allocation Length
5
Control
