Datasheet
Travelstar 80GN Hard Disk Drive Specification
138
13.22 Read Verify Sectors (40h/41h)
Table 93: Read Verify Sectors (40h/41h)
The Read Verify Sector(s) command verifies one or more sectors on the device. No data is transferred to the host.
The difference between the Read Sector(s) command and Read Verify Sector(s) 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.
LAB Low 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)
LBA 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 (Mid) 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; this bit is ignored.
Input parameters from the device
Sector Count This is the number of requested sectors not transferred. This number will be zero, unless
an unrecoverable error occurs.
LBA Low This is the sector number of the last transferred sector. (L = 0)
In LBA mode this register contains the current LBA bits 0–7. (L = 1)
Command Block Output Registers Command Block Input Registers
Register 7 6 5 4 3 2 1 0 Register 7 6 5 4 3 2 1 0
Data - - - - - - - - Data - - - - - - - -
Feature - - - - - - - - Error see below
Sector Count V V V V V V V V Sector Count V V V V V V V V
LBA Low V V V V V V V V LBA Low V V V V V V V V
LBA Mid V V V V V V V V LBA Mid V V V V V V V V
LBA High V V V V V V V V LBA High V V V V V V V V
Device 1 L 1 D H H H H Device - - - - - H H H H
Command 0 0 1 0 0 0 0 R Status see below
Error Register Status Register
7654321 0 76543 21 0
CRC UNC 0 IDN 0 ABT T0N AMN BSY RDY DF DSC DRQ COR IDX ERR
0V0V0V0 V 0V0V- 0- V