Mode sense 1ah/5ah, Mode sense 1ah/5ah 91, Pre-execution checks – HP C737990900 User Manual
Page 91: Command descriptor block
Commands 91
Co
m
m
an
ds
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
for full descriptions of the Mode
Parameters.If a
MODE 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