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Command Specifications
4.2.5 WRITE AND VERIFY (2E)
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, then reads those data and performs a
Verify check.
The functions of this command related to write operations are the same as those
of the WRITE EXTENDED command (Section 4.2.4), with the exception that the
write cache function and automatic alternate block allocation function cannot be
applied. When zero is specified in the "Transfer block count," this command is
terminated normally without performing seek or pre-fetch.
The specification in bit 4 of CDB byte 1 is disabled in the IDD and the specified
value is disregarded.
The VERIFY check executed by this command is the only the ECC (data portion)
normalcy check. Error recovery processing during execution of the VERIFY
check conforms to the mode specified by the MODE SELECT parameter (Verify
error recovery parameter). For example, when data correction processing is not
prohibited, if a correctable data check is detected during the VERIFY check, the
VERIFY check is regarded as having terminated successfully.
When "1" is set in bit 1 (BytChk bit) of CDB byte 1, the IDD reads data blocks
from the disk and compares the data with the write data transferred from the INIT
after terminating the write operation. This IDD does not support that function,
however, so it performs the operation executed when "0" is set in bit 1 (BytChk
bit) of CDB byte 1.
4-148
7
6
5
0
0
0
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'2E'
×
0
0
BytChk
0
0
0
0
0
0
1
0
0
0
0
0
0
C141-C012
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