56 Commands
Load/Unload Specific Status:
Following a successful LOAD command, CHECK CONDITION is posted to all
initiators other than the initiator of the
LOAD command. The sense key is set to
UNIT ATTENTION, with additional sense of 2800h (not ready to ready
transition). There is an exception to this: if a load occurs when the tape is
already loaded, no
UNIT ATTENTION sense is generated.
Once
UNIT ATTENTION is cleared, unsolicited positional sense is set. The sense
key will be
NO SENSE with additional sense of 0004h (BOT detected).
If an unformatted tape is inserted, the drive loads it and it behaves as if it is a
blank tape.
If a cartridge with no Cartridge Memory or a failed Cartridge Memory is
loaded,
CHECK CONDITION is returned with a sense key of MEDIUM ERROR,
with additional sense of 5200h (cartridge fault).
Loading a Cartridge
The drive loads a tape automatically when it is inserted, without any host
interaction. If the load is successful, media access commands are permissible
(see the Media Access check).
If the tape is already loaded when a Load request is received, the tape is
positioned at the beginning of the tape (as though a
REWIND had been sent).
Unlike a “full” load,
UNIT ATTENTION with additional sense of 2800h (not
ready to ready transition) is not generated for other hosts.
If the tape is in the process of being loaded when the Load request is received,
the drive will wait for the load to complete and, assuming the load was
successful, take one of the following actions:
■ If the Load was issued by the current host (that is, a previous immediate-
reported load) and completed successfully,
GOOD status is reported. No
further action is taken.
Hold 0 A normal load/unload will be performed.
1 A load will cause the cartridge to be pulled in and seated in the drive, but the tape will
not be threaded.
An unload will cause the tape to be unthreaded, but the cartridge will not be ejected.
In Hold position, the Cartridge Memory is accessible.
ReTen This field is ignored.
Load 0 The drive performs an unload operation.
1 The drive performs a load operation.
