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10.8.9 Read Verify (40h)
COMMAND CODE
0 1 0 0 0 0 0 0
REGISTER
REGISTER SETTING NORMAL COMPLETION
DR drive no. no change
CY starting cylinder last possible
HD starting head last possible
SN starting sector start sector
SC no. of sector to be read 00H
LBA starting address last address
This command is identical to a Read command except that the drive has read the data from the media, and
the DRQ bit is not set and no data is sent to the host. This allows the system to verify the integrity of the
drive. A single interrupt is generated upon completion of a command or when an error occurs.
10.8.10 Read Verify EXT (42h)
COMMAND CODE
0 1 0 0 0 0 1 0
REGISTER
REGISTER SETTING NORMAL COMPLETION
DR drive no. no change
LBA
Low
Current
Previous
LBA(7:0)
LBA(31:24)
HOB=0
HOB=1
last address
last address
LBA
Mid
Current
Previous
LBA(15:8)
LBA(39:32)
HOB=0
HOB=1
last address
last address
LBA
High
Current
Previous
LBA(23:16)
LBA(47:40)
HOB=0
HOB=1
last address
last address
SC Current
Previous
sector count(7:0)
sector count(15:8)
HOB=0
HOB=1
00H
00H
FT Current
Previous
reserved
reserved
HOB=0
HOB=1
no change
no change
This command is identical to a Read EXT command except that the drive has read the data from the media,
and the DRQ bit is not set and no data is sent to the host. This allows the system to verify the integrity of
the drive. A single interrupt is generated upon completion of a command or when an error occurs.
This command is available in LBA addressing only.