HP C737990900 - Manual (Page 55)

Commands 55
Co
m
m
an
ds
LOAD/UNLOAD 1Bh
The LOAD / UNLOAD command allows the host to specify that a tape cartridge
present in the drive is either made ready for data transfer (“loaded”) or
disabled for data transfer (if Prevent Media Removal is set). It can also cause
the cartridge to be ejected from the drive (“unloaded”).
Pre-Execution Checks:
If an unload is to be performed, the drive checks if the tape is currently being
loaded. If it is, CHECK CONDITION is reported with a sense key of NOT READY
and additional sense of 0401h (becoming ready).
If a load is to be performed, the drive checks to ensure that a tape cartridge is
present. If not, it reports CHECK CONDITION with a sense key of NOT READY
and additional sense of 3A00h (medium not present). If the media is currently
being unloaded or ejected, it reports CHECK CONDITION with sense key of
NOT READY and additional sense of 0400h (cause not reportable).
Command Descriptor Block:
CDB Fields:
Illegal Field Reservation Deferred Error
Unit Attention Diagnostic Status Media Information
7 6 5 4 3 2 1 0
0 Operation Code (1Bh)
1 Reserved (0) Immed
2 Reserved (0)
3 Reserved (0)
4 Reserved (0) Hold EOT (0) ReTen Load
5 Control
Immed 0 The drive reports status after the command has completed.
1 The drive reports status when it starts the command (after any pre-execution checks
and prerequisite unloads have completed).