HP C737990900 - Manual (Page 152)

152 Commands
VERIFY 13h
V ERIFY 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
0 Operation Code (13h)
1 Reserved (0) Immed(0) BCmp(0) Fixed
2 (MSB)
Verification Length 3
4
(LSB)
5 Control
Immed 0 The Immediate Reporting option is not supported, so this bit must be 0.