SCSI Commands

READ BLOCK LIMITS Command (05h) (continued)

In SCSI-3 configurations, Byte 0 appears as shown below:

0

Reserved

Granularity

 

 

The Granularity field is described in the table below.

Table 5–62 READ BLOCK LIMITS Data - Field Descriptions

Field Name

Description

Granularity (SCSI-3 Only)

This field indicates the supported block size granularity. The DLT

 

7000 tape drive supports all block sizes n such that n minus the

 

minimum block length limit is a multiple of 2x (where x is the value in

 

the Granularity bits), and n is greater than or equal to the Minimum

 

Block Length Limit and less than or equal to the Maximum Block Size

 

Limit. For the DLT 7000 system, the content of the Granularity field is

 

1 (since block sizes must be a multiple of 2; 21 = 2).

 

For backward compatibility, the DLT 7000 will process requests that

 

do not meet Granularity criteria, except for Odd-byte Multiple Block

 

Fixed Block WRITE commands when connected to a Wide (16-bit)

 

SCSI bus.

Maximum Block Length

The value in this field indicates the maximum block size. The tape

 

drive supports a maximum block length of 16,777,215 (16 MB-2) for

 

10, 20, or 35 GB format. A maximum block length of 256 K bytes is

 

supported for 2.6 GB or 6.0 GB formats.

Minimum Block Length

The value in this field indicates the minimum block size. The tape

 

drive supports a minimum block length of 2 bytes.

 

 

5-132

Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual Read Block Limits Command 05h, Read Block Limits Data Field Descriptions
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DLT 7000 specifications

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