Read Verify Sectors (40H/41H); Figure 98. Read Verify Sectors Command (40H/41H) - IBM IC25N020ATDA04 - Travelstar 20 GB Hard Drive Specifications

13.19 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 98. 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: data is
transferred to the host during a Read Sectors command; 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
Sector Number
Cylinder High/Low
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
This is the number of continuous sectors to be verified. If zero is specified,
256 sectors will be verified.
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)
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)
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
Command Block Input Registers
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
149
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 0
DSC DRQ COR IDX ERR
V - 0 - V