Quantum Audio Travan 40 Tape Drive STT3401A - Manual (Page 41)

ATAPI Interface Chapter 5
Seagate Travan 40 Product Manual Page 33
LOAD/UNLOAD (Group 0, Op. Code 1B)
This command has three functions.
•
To position (LOAD) a tape cartridge to BOT
•
To eject (UNLOAD) a cartridge
•
To retension the installed cartridge in conjunction with a Load/Unload operation
Note. The Imation Travan Mini Cartridge specification requires cartridge
conditioning under specified conditions. Conditioning is achieved by running
the tape three complete end-to-end passes, and retensioning a cartridge
when loading is recommended.
While loading or unloading, the LED blinks slowly.
When an UNLOAD command is received, if the previous WRITE command
terminated with a Check Condition, any buffered data that cannot be written to tape
will be lost. All media access commands will be terminated with a Check Condition
and the Sense Key will be set to 2h (Not Ready) after successful execution of an
UNLOAD command.
CDB for LOAD/UNLOAD Command
Data Bits
Byte 7 6 5 4 3 2 1 0 Hex
0 0 0 0 1 1 0 1 1 1B
1 0 0 0 0 0 0 0 IMM 0X
2 0 0 0 0 0 0 0 0 00
3 0 0 0 0 0 0 0 0 00
4 0 0 0 0 0 0 RET LOA 0X
5 0 0 0 0 0 0 0 0 00
NOTE: The ATAPI interface does not have an IMM bit or functional equivalent. The
DSC and BUSY bits in the Host taskfile status register indicate bus and
command status. See the ATAPI note on page 80.
RET: The retension bit determines whether a retension operation is to be performed
as a part of the LOAD/UNLOAD command or not. A Retension operation is
performed by running the tape to EOT, then back to BOT. It is recommended to
retension the tape before every read/write of the tape. When set to 0, no retension
takes place. When set to 1, a tape retension is performed.
LOA: The LOA bit determines whether it is a LOAD or UNLOAD command. When
set to 0, an UNLOAD command is designated. When set to 1, a LOAD command is
designated.