SCSI Commands

5.6LOCATE COMMAND (2Bh)

The LOCATE command is used to do high-speed positioning to the specified block address.

The READ POSITION command can be used to obtain the block address, when writing, when particular blocks of data (a data file, for example) are about to be written. The LOCATE command can then be used to position the tape back at the same logical position for high performance restore operations of particular blocks of data.

Bit

7

 

6

 

5

4

 

3

2

1

0

Byte

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

Operation Code (2Bh)

 

 

 

 

 

 

 

 

 

 

 

 

1

 

Logical Unit Number

 

 

Reserved

BT

CP

Immed

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(MSB)

 

 

 

 

 

 

 

 

 

 

3 - 6

 

 

 

 

 

Block Address

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(LSB)

7

 

 

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

 

 

 

 

 

 

Partition

 

 

 

 

 

 

 

 

 

 

 

 

9

 

Unused

 

 

 

Reserved

 

Flag

Link

 

 

 

 

 

 

 

 

 

 

 

 

Figure 5–12 LOCATE Command Descriptor Block - Data Format

5-30

Quantum DLT 7000 Tape System

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Image 134
Quantum Instruments DLT 7000 manual Locate Command 2Bh, Locate Command Descriptor Block Data Format
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DLT 7000 specifications

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