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Deskstar 7K500 and Deskstar E7K500 Hard Disk Drive Specification

171

12.27 Read Verify Sectors (40h/41h)

Table 126: Read Verify Sectors (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 Sector(s) command and the Read Verify Sector(s) command is whether 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 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. this bit is ignored.

Input parameters from the device

Sector Count This is the number of requested sectors not verified. This number will be zero unless an

unrecoverable error occurs.

Sector Number 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

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

Sector Number V V V V V V V V Sector Number V V V V V V V V

Cylinder Low V V V V V V V V Cylinder Low V V V V V V V V

Cylinder High V V V V V V V V Cylinder High V V V V V V V V

Device/Head 1 L 1 D H H H H Device/Head - - - - 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

Hitachi HDS725050KLA360 User Manual

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