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VERIFY Command (13h) SDLT 600 SCSI Interface Guide

4-242 January 2005 81-81200-02 REV A01

4.35 VERIFY Command (13h)

The VERIFY command directs the SDLT tape drive to verify one or more blocks beginning with the

next block on the tape. The drive verifies both CRCs and EDCs.

Figure 4-131. VERIFY Command Descriptor Block — Data Format

Bit

Byte

7 6 5 4 3 2 1 0

0 Operation Code (13h)

1 Reserved Immed BytCmp Fixed

2 – 4

(MSB)

Verification Length

(LSB)

5 Control

Table 4-142. VERIFY Command Data — Field Descriptions

Field Name Description

Immed Immediate. When set to 1, the VERIFY command completes, provided it has

begun processing, before the drive performs any tape medium movement.

BytCmp Byte Compare. Not supported. Must be set to 0.

Fixed Specifies whether the drive is to verify fixed-length or variable-length blocks.

When set to 0, variable-block mode is requested. The drive verifies a single

block with the Verification Length specifying the maximum number of bytes

the initiator has allocated for verification.

When set to 1, the Verification Length specifies the number of blocks the drive

is to verify. This is valid only if the drive is currently operating in fixed-block

mode.

Verification

Length

Specifies the amount of data to verify, in blocks or bytes, as indicated by the

Fixed field.

SDLT 600

SCSI Interface Guide

SCSI Commands

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REV A01

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