Write Extended (2A) - Fujitsu MAX3073NC - SCSI,80, Dell DC961,Hard Drive Scsi Logical Interface Specifications

Command Specifications
Note:
Even when there is an error in the specification in the CDB, or when a write operation to the disk
media cannot be executed normally due to various other causes, the transfer of data (data is pre-
fetched to the data buffer) from the INIT to the IDD may be executed. In this case, the length of data
transferred from the INIT to the IDD is undefined. Also, all the data transferred to the IDD will not
necessarily be actually written to the disk media. However, if the command is terminated with a
CHECK CONDITION status and the sense key of the sense data indicates "ILLEGAL REQUEST
[=5]," the data from that command is not written to the disk media by a write operation.
3.2.4

WRITE EXTENDED (2A)

Bit
Byte
0
1
2
3
4
5
6
7
8
9
This command transfers the number of blocks of data specified in the "Transfer block count" field from
the INIT and writes them in continuous logical data blocks with the logical data block on the disk media
specified in the "Logical block address" field in the CDB as the top.
The functions of this command are the same as those of the Group 0 WRITE command (Section 3.2.3)
with the exception that it is possible to specify 4-byte logical block addresses and 2-byte transfer block
counts. However, when zero is specified for the "Transfer block count," the command is terminated
normally without pre-fetch being performed.
•
FUA (force unit access)
When this bit is "0", it indicates that the IDD satisfy the command by accessing the cache memory.
For write operations, logical blocks may be transferred directly to the cache memory. GOOD status
may be returned to the INIT prior to writing the logical blocks to the medium. Any error that occurs
after the GOOD status is returned is a deferred error and information regarding the error is not
reported until a subsequent command.
3-74
7 6 5
LUN
Logical Block Address (MSB)
Logical Block Address
Logical Block Address
Logical Block Address (LSB)
0 0 0
Transfer Block Count (MSB)
Transfer Block Count (LSB)
0 0 0
4 3 2
X'2A'
×
FUA 0
0 0 0
0 0 0
1 0
0 0
0 0
0 Link
C141-C010