Command Specifications
220 C141-C013
4.2.6 VERIFY (2F) Bit
Byte 7 6 5 4 3 2 1 0
0 X'2F'
1 0 0 0 × 0 0 BytChk
0
2 Logical Block Address (MSB)
3 Logical Block Address
4 Logical Block Address
5 Logical Block Address (LSB)
6 0 0 0 0 0 0 0 0
7 Transfer Block Count (MSB)
8 Transfer Block Count (LSB)
9 0 0 0 0 0 0 0 0
This command reads the number of continuous logical data blocks specified in the
"Block count" field with the logical data block on the disk media which is
specified in the "Logical block address" field in the CDB as the top, then executes
a VERIFY check on those data.
The "Block count" field in the CDB specifies the number of data blocks which is
the object of the VERIFY check. When zero is specified in the "Transfer block
count," the command is terminated normally without performing seek and pre-
fetch.
If "1" is specified in bit 1 of CDB byte 1, the BytChk bit, the HDD performs a
comparison check of the data read from the disk media and the data transferred
from the INIT. If the data do not match during this mode, the command is
terminated with a CHECK CONDITION status (MISCOMPARE [=E] /
Miscompare during verify operation [=1D-00]).
If "0" is specified in bit 1 of CDB byte 1, the BytChk bit, an ECC (data portion)
normalcy check is executed. Also, error recovery processing during execution of
the verify check is according to the mode specified by the MODE SELECT
parameter (verify error recovery parameter). For example, if data correction
processing is not prohibited, even if a correctable data check is detected, it is
regarded as if the verify check succeeded.