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152 Commands

VERIFY 13h

VERIFY verifies one or more blocks beginning with the next block on the tape.

The verification is media verification only. It reads data from the tape as it

would for a read but then immediately discards it. No data is transferred

between the host and drive.

The command is identical to the

READ command in most respects. The pre-

execution checks are identical. Sense data reporting on errors/exceptions is

identical. The only differences are:

■ No data phases occur during verification.

■ The Verify command has no SILI bit. When an illegal length record is

encountered,

Verify behaves like READ with the SILI bit clear.

Note V

erify will not complete until all data has been read. It does

support the ANSI “byte compare” or “Immed” options (see the

ANSI SCSI specification).

Pre-Execution Checks:

Command Descriptor Block:

CDB Fields:

Illegal Field Fixed Bit Reservation Deferred Error

Unit Attention Media Access Diagnostic Status

7 6 5 4 3 2 1 0

Operation Code (13h)

Reserved (0) Immed(0) BCmp(0) Fixed

(MSB)

Verification Length

(LSB)

Control

Immed 0 The Immediate Reporting option is not supported, so this bit must be 0.

1 2 ... 147 148 149 150 151 152 153 154 155 156 157 ... 173 174

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Hp C737990900 Manual do Utilizador Página 152