Reference Guide

Chapter 4 SCSI Commands
LOCATE Command (2Bh)
DLT-S4 Interface Reference Guide 56
LOCATE Command (2Bh) 4
The LOCATE command performs high-speed positioning to a specified
block address. Use the
READ POSITION command to obtain the block
address associated with the current position on tape. Then use the
LOCATE command to position the tape at the same logical position for
high-performance restore operations of particular blocks of data.
Figure 21 LOCATE Command
Descriptor Block — Data
Format
Table 32 LOCATE Command
Descriptor Block
— Field
Descriptions
Bit
Byte
7 6 5 4 3 2 1 0
0 Operation Code (2Bh)
1 Reserved BT CP Immed
2 Reserved
3 — 6
(MSB)
Logical Object Identifier
(LSB)
7 Reserved
8 Partition
9 Control
Field Description
BT Block Type. The drive ignores this bit.
CP Change Partition. Must set to 0.
Immed Immediate. When set to 1, the drive returns status as soon as the operation
starts. When set to 0, the drive returns status after the operation has completed.
Logical Object Identifier Specifies the Logical Object Identifier to which the drive positions the medium.
Partition Not applicable; the drive ignores this bit (see CP field).