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11.33 Read Verify Sector(s) (40h/41h)
Com m and Block Output Registers
Register
7
6
Data
-
-
Feature
-
-
Sector Count
V
V
Sector Number
V
V
Cylinder Low
V
V
Cylinder High
V
V
Device/Head
1
L
Command
0
0
Error Register
7
6
5
4
CRC UNC
0
IDN
0
V
0
V
Table 191 Read Verify Sector(s) Command (40h/41h)
The Read Verify Sector(s) verifies one or more sectors on the device. No data is transferred to the host.
The difference between Read Sector(s) command and Read Verify Sector(s) command is whether the data is
transferred to the host or not.
If an uncorrectable error occurs, the read verify will be terminated at the failing sector.
Output Parameters To The Device
Sector Count
Sector Number
Cylinder High/Low
H
R
Input Parameters From The Device
Sector Count
Sector Number
Cylinder High/Low
H
5
4
3
2
1
0
-
-
-
-
-
-
-
-
-
-
-
-
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
1
D
H
H
H
H
1
0
0
0
0
R
3
2
1
0
0
ABT
T0N AMN
0
V
0
0
The number of continuous sectors to be verified. If zero is specified, then 256 sectors will
be verified.
The sector number of the first sector to be transferred. (L=0)
In LBA mode, this register contains LBA bits 0 – 7. (L=1)
The cylinder number of the first sector to be transferred. (L=0)
In LBA mode, this register contains LBA bits 8 – 15 (Low), 16 – 23 (High). (L=1)
The head number of the first sector to be transferred. (L=0)
In LBA mode, this register contains LBA bits 24 – 27. (L=1)
The retry bit, but this bit is ignored.
The number of requested sectors not verified. This will be zero, unless an unrecoverable
error occurs.
The sector number of the last transferred sector. (L=0)
In LBA mode, this register contains current LBA bits 0 – 7. (L=1)
The cylinder number of the last transferred sector. (L=0)
In LBA mode, this register contains current LBA bits 8 – 15 (Low), 16 – 23 (High). (L=1)
The head number of the last transferred sector. (L=0)
In LBA mode, this register contains current LBA bits 24 – 27. (L=1)
Western Digital Hard Disk Drive OEM Specification
Com m and Block Input Registers
Register
7
6
Data
-
-
Error
Sector Count
V
V
Sector Number
V
V
Cylinder Low
V
V
Cylinder High
V
V
Device/Head
-
-
Status
Status Register
7
6
5
4
BSY
RDY
DF
DSC
0
V
0
V
219
5
4
3
2
1
0
-
-
-
-
-
-
...See Below ...
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
-
-
H
H
H
H
...See Below ...
3
2
1
0
DRQ COR
IDX
ERR
-
0
-
V
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