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SCSI Description
5-172 Maxtor Atlas 10K III
The WRITE AND VERIFY command writes host-supplied data to the unit and
verifies it was written correctly. The data format and field descriptions are shown in
Table 5-216 and Table 5-217 respectively.
WRITE AND VERIFY Command Descriptor Block-Data Format
WRITE AND VERIFY Command-Field Descriptions
0 Operation Code (2Eh)
1 Reserved DPO Reserved BytChk RelAdr
2 - 5 Logical Block Address
6 Reserved
7 - 8 Transfer Length
9 Control
DPO
Disable Page Out. When the value of the field is 1, the drive tells the con-
troller to bypass cache as much as possible. The buffers used for the
WRITE data are given a low priority. This bit may be useful if the host CPU
is performing a background copy operation and does not want to wipe out
the drive's cache.
When DPO is 0, the drive tells the controller to cache this WRITE data in a
normal manner.
NOTE: The drive normally assigns a low priority to write caching. There-
fore, the DPO bit in a WRITE command is essentially ignored.
BytChk
Byte Check. When 1, the drive performs a byte-by-byte comparison of the
data written on the media with the data transferred from the initiator.
When 0, the drive performs a medium verification with no data comparison
of the sectors written by the command.
RelAdr Relative Address. This feature is not supported and the field must be 0.
Logical Block
Address
The address of the first logical block where the WRITE operation will occur.
Transfer Length
The number of contiguous logical blocks of data to write and verify. The
drive returns CHECK CONDITION status with the correct sense data if the
specified transfer would cause the write operation to extend beyond the
Logical Block Address space.