SCSI Commands

5.13READ BLOCK LIMITS COMMAND (05h)

The READ BLOCK LIMITS command directs the tape drive to report it’s block length limits.

Bit

7

 

6

 

5

4

 

3

2

1

0

Byte

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

Operation Code (05h)

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

Logical Unit Number

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

 

2 - 4

 

 

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

5

 

Unused

 

 

 

Reserved

 

Flag

Link

 

 

 

 

 

 

 

 

 

 

 

 

Figure 5–62 READ BLOCK LIMITS Command Descriptor Block - Data Format

The READ BLOCK LIMITS data shown below is sent during the DATA IN phase of the command. The command does not reflect the currently selected block size, only the available limits. MODE SENSE is the command that returns the current block size.

Bit

7

6

5

 

4

 

3

 

2

1

0

Byte

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(MSB)

 

 

 

 

 

 

 

 

 

 

1 - 3

 

 

 

 

Maximum Block Length

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(LSB)

 

(MSB)

 

 

 

 

 

 

 

 

 

 

4 - 5

 

 

 

Minimum Block Length (0001h)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(LSB)

Figure 5–63 READ BLOCK LIMITS Data - Data Format

Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual Read Block Limits Command 05h, Read Block Limits Command Descriptor Block Data Format

DLT 7000 specifications

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