13.18 Read Verify Sectors (40h/41h)
see belowStatus0 0 1 0 0 0 0 RCommand
- - - - H H H HDevice/Head1 L 1 D H H H HDevice/Head
V V V V V V V VCylinder HighV V V V V V V VCylinder High
V V V V V V V VCylinder LowV V V V V V V VCylinder Low
V V V V V V V VSector NumberV V V V V V V VSector Number
V V V V V V V VSector CountV V V V V V V VSector Count
see belowError- - - - - - - -Feature
- - - - - - - -Data- - - - - - - -Data
7 6 5 4 3 2 1 0Register7 6 5 4 3 2 1 0Register
Command Block Input RegistersCommand Block Output Registers
V-0-V0V0V0V0V0V0
ERRIDXCORDRQDSCDFRDYBSYAMNT0NABT0IDN0UNCCRC
0123456701234567
Status RegisterError Register
Figure 103. Read Verify Sectors command (40h/41h)
The Read Verify Sectors command verifies one or more sectors on the device. No data is transferred to
the host.
The difference between the Read Sectors command and Read Verify Sectors command is that data is
transferred to the host during a Read Sectors command and data is not transferred to the host during a
Read Verify Sectors command.
If an uncorrectable error occurs, the read verify will be terminated at the failing sector.
Output parameters to the device
Sector Count This is the number of continuous sectors to be verified. If zero is specified,
256 sectors will be verified.
Sector Number This is the sector number of the first sector to be transferred. (L = 0)
In LBA mode this register contains the LBA bits 0–7. (L = 1)
Cylinder High/Low This is the cylinder number of the first sector to be transferred. (L = 0)
In LBA mode this register contains the LBA bits 8–15 (Low) and bits
16–23 (High). (L = 1)
H This is the head number of the first sector to be transferred. (L = 0)
In LBA mode this register contains the LBA bits 24–27. (L = 1)
R This is the retry bit, but this bit is ignored.
Travelstar 60GH & 40GN hard disk drive specifications
145
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