Seagate ST3285N, Product Manual

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3.5.5 Write and Verify command (2E
H
)
When the drive receives the Write and Verify command, it writes the data
sent by the initiator to the media and then verifies that the data is correctly
written.
If the host adapter supports disconnection, the drive disconnects while
it is executing this command.
Bit
Byte
7 6 5 4 3 2 1 0
0 0 0 1 0 1 1 1 0
1 LUN 0 0 0
BYT
CHK
REL
ADR
2–5 Logical block address
6 0 0 0 0 0 0 0 0
7–8 Transfer length
9 0 0 0 0 0 0 Flag Link
Byte 1 If the
BYT CHK (byte check) bit is zero, the drive verifies
the media without performing a byte-by-byte comparison of
the data stored there. If the BYT CHK bit is one, the drive
verifies the media and performs a byte-by-byte comparison
of the data stored there.
If the REL ADR bit is one, the logical block address field
specifies the first logical block of the range of logical blocks
to be written and verified by the drive. If the REL ADR bit is
one, the logical block address field is a two’s complement
displacement. This displacement is added to the logical
block address last accessed on the drive to determine the
logical block address for this command. The REL ADR bit
should only be one if linked commands are used.
Bytes 2–5 The logical block address field specifies the logical block
where the drive begins writing and verifying the data.
Bytes 7–8 The transfer length field specifies the number of contiguous
logical blocks to be transferred. If the transfer length is zero,
the initiator does not transfer any data and the drive does
not write or verify any data. This condition is not considered
an error.
66 ST3655 Family SCSI Drives Product Manual, Rev. A