Write buffer 3bh, Write buffer 3bh 16, Pre-execution checks: command descriptor block – HP C737990900 User Manual
Page 160
160 Commands
WRITE BUFFER
3Bh
Write Buffer
is used to transfer data into memory on the drive for the purposes
of diagnostics, tests or firmware upgrade. The data is placed into one of the
drive buffers depending on the Mode and Buffer ID fields of the command.
Caution
Do not attempt to use the buffer modifying functions of this
command unless you really know what you are doing. The buffer
modifying functions are intended as a diagnostic aid to be used
in conjunction with the
Read Buffer
command. It is not possible to
modify data in the buffer so that it subsequently written to media
because all host data is flushed before executing the command.
The firmware download functions are intended for use by manufacturing and
by customers using upgrade utilities supplied by HP.
Pre-Execution Checks:
Command Descriptor Block:
Illegal Field
Reservation
Deferred Error
Unit Attention
7
6
5
4
3
2
1
0
0
Operation Code (3Bh)
1
Reserved (0)
Mode
2
Buffer ID
3
(MSB)
Buffer Offset
5
(LSB)
6
(MSB)
Parameter List Length
8
(LSB)
9
Control