Quantum DLT 7000 Manuál stáhnout pdf (Strana 241)

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101

SCSI Commands

Quantum DLT 7000 Tape System 5-137

5.15 READ 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

Byte

7 6 5 4 3 2 1 0

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.

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