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Chapter 4 SCSI Commands

VERIFY Command (13h)

DLT-S4 Interface Reference Guide 334

VERIFY Command (13h) 4

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

beginning with the next block on the tape. The drive verifies both CRCs

and EDCs.

Figure 169 VERIFY Command

Descriptor Block—Data Format

Table 189 VERIFY Command

Data — Field Descriptions

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

Field 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. 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 block size.

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.

1 2 ... 363 364 365 366 367 368 369 370 371 372 373 ... 385 386

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