Write (Extended):(2A ) - Hitachi DK32EJ - Ultrastar Series 36.9 GB Hard Drive Reference Manual

6.35 WRITE (EXTENDED):(2A
Bit
Byte
0
1 Logical Unit Number
2
3
4
5
6
7
8
9 Vendor Unique
The WRITE command writes the number of consecutive data blocks from the host
computer specified in the Transfer Length field to the medium starting at the block
address specified in the Logical Block Address field.
The DPO (Disable Page Out) bit is used to determine the priority of the logical block
data read by this command in the cache.
But in this controller, the priority of the retained data is controlled by the value of the
Retention Priority field in the mode page 8 (Caching Page; refer to Table 6-45) or the
algorithm implementing the cache replacement strategy irrespective of DPO bit.
If the FUA (Force Unit Access) bit is set to 1, the controller returns the status on
completion of writing to the medium.
If the FUA bit is set to 0, the controller returns the status prior to writing to the
medium.
A Transfer Length of 0 specifies that no logical block is to be transferred. The
controller in this case only seeks to the track containing the block specified in the
Logical Block Address.
WRITE (EXTENDED):(2Ah)
6 COMMAND DESCRIPTIONS
)
H
7 6 5
0 0 1
Logical Block Address (MSB)
Logical Block Address (LSB)
0 0 0
0 0 0
4 3
Operation Code (2A
0 1
DPO FUA
Logical Block Address
Logical Block Address
Reserved
0 0
Transfer Length (MSB)
Transfer Length (LSB)
Reserved
0 0
OEM MANUAL:K6602771
2 1
)
H
0 1
Reserved RelAdr
0 0
0 0
Flag
0
Revision: 2 / Date: 2002.12.19
Page: 282 / 313
0
0
0
0
Link