Read Verify Sectors (40H/41H); Figure 104. Read Verify Sectors Command (40H/41H) - IBM DTLA-305040 - Deskstar 41.1 GB Hard Drive Specifications
3.5 inch ultra ata/100 hard disk drive
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12.18 Read Verify Sectors (40h/41h)
Command Block Output
Registers
Register
Data
Feature
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Command
Error Register
7
6
5
CRC
UNC
0
0
V
0
Figure 104. Read Verify Sectors Command (40h/41h)
The Read Verify Sectors verifies one or more sectors on the device. No data is transferred to the host.
The difference of Read Sectors command and Read Verify Sectors 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
7 6 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
V V V V V V V V
1 L 1 D H H H H
0 0 1 0 0 0 0 R
4
3
2
1
IDN
0
ABT
T0N
AMN
V
0
V
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. If set to one, then retries are disabled.
Deskstar 40GV & 75GXP hard disk drive specifications
Command Block Input
Register
Data
Error
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Status
Status Register
0
7
6
5
BSY
RDY
DF
V
0
V
0
139
Registers
7 6 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
V V V V V V V V
- - - - H H H H
see below
4
3
2
1
DSC
DRQ
COR
IDX
V
–
0
–
0
ERR
V
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