HP C737990900 - Manual (Page 72)

72 Commands
MODE SELECT 15h/55h
M ODE SELECT is used to send configuration data to the drive. Both 6-byte and
10-byte versions of the command are supported.
The Mode Select parameter list is transferred from the host to the drive during
the data-out phase. It contains zero or more bytes of information. If any
information is sent, it should consist of a Mode Parameter Header followed by
zero or more mode select pages. Internal parameters are set according to the
values specified in the header and pages. Fields in the parameter list are
checked and the operation will terminate if an error is found.
Note The drive does not check that the parameter list is correct before
modifying internal parameters. The list is checked as the
operation proceeds, so if there is an error in the list, all
parameters up to that point will be set to their new values, but
the parameter in error and later parameters will not be updated.
Pre-Execution Checks:
Note Failure to flush write-behind data will be reported as a Deferred
Error.
The parameter list length must be such that only “entire” parts of a parameter
list are sent. It is illegal to send a partial mode parameter header, a partial
mode block descriptor or a partial mode page. If this happens, then CHECK
CONDITION status is reported. The sense key is set to ILLEGAL REQUEST . The
additional sense is set to 1A00h (parameter list length error).
Extra checks may be performed on the data, see the descriptions for the
parameter list for more details.
Command Descriptor Block
6-Byte version
Illegal Field Reservation Deferred Error Unit Attention
7 6 5 4 3 2 1 0
0 Operation Code (15h)