Reference Guide

Chapter 4 SCSI Commands
LOAD UNLOAD Command (1Bh)
DLT-S4 Interface Reference Guide 54
LOAD UNLOAD Command (1Bh) 4
The LOAD UNLOAD command instructs the DLT-S4 tape drive to load or
unload the tape inside the data cartridge. If no data cartridge is in the
drive, the
LOAD UNLOAD command returns a CHECK CONDITION status
with the Sense Key set to
NOT READY. Likewise, if the drive receives a
LOAD UNLOAD command with the Immediate bit set and then it receives
another command that requires tape motion or if it receives a
TEST UNIT
READY
command, the drive returns a CHECK CONDITION status with the
Sense Key set to
NOT READY.
Before executing the
LOAD UNLOAD command, the drive writes any
cached write data to the tape.
Figure 20 LOAD UNLOAD
Command Descriptor Block
—
Data Format
Bit
Byte
7 6 5 4 3 2 1 0
0 Operation Code (1Bh)
1 Reserved Immed
2 — 3 Reserved
4 Reserved Hold EOT ReTen Load
5 Control