SCSI Commands

5.15READ POSITION COMMAND (34h)

The READ POSITION command is used to read a position identifier or SCSI Logical Block Address (LBA). The LOCATE command uses this identifier to position back to this same logical position in a high-performance fashion.

 

Bit

 

7

 

6

5

4

 

3

2

1

 

0

 

 

Byte

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

Operation Code (34h)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

Logical Unit Number

 

 

 

Reserved

 

 

BT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2 - 8

 

 

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9

 

 

Unused

 

 

Reserved

 

Flag

 

Link

 

 

 

 

 

 

 

 

 

 

 

Figure 5–67 READ POSITION Command Descriptor Block - Data Format

 

 

 

Table 5–65 READ POSITION Command Descriptor Block - Field Descriptions

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Field Name

Description

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BT

 

 

Block Type. This bit indicates how the position is to be interpreted. Since the

 

 

 

 

 

 

tape drive uses the same logical block regardless of the setting of this bit, the

 

 

 

 

 

 

setting is ignored. The logical block address values include all recorded objects:

 

 

 

 

blocks and filemarks.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOTE

The drive returns CHECK CONDITION with UNIT NOT READY sense key with the READ POSITION command if the media is not ready to be accessed.

Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual Read Position Command 34h
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