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AIT–1
AIT–2/3/3Ex
4.3. Internal Function
The Load Sequence
4.3.1.
Load/Unload (Effective for MIC cassette, only)
During load sequence, the following occurs:
(1) The drive mechanism accepts the cassette and threads the tape. The tape is then moved to
Beginning-of-Tape(BOT) and the Reference area is checked to find the tape format. If the format is not
AIT-3Ex, the drive rewinds the tape to BOT and awaits either a Write, Partitioning, Mode Select or an UNLOAD
command.
(2) The System area is then accessed and the System log is read into the drive.
(3) Finally the drive goes on-line.
4.3.2.
The Unload Sequence
Media Load/Unload (Effective for MIC cassette, only)
The drive will always write any buffered data out to tape followed by an EOD prior to initiating the Unload sequence.
During this sequence the tape is rewound to BOT and, if the tape is write-enabled, the copy of the tape log held in
RAM is written back to tape. The tape is then rewound to BOM and the tape unthreaded from the mechanism. At this
stage the tape is either retained in the drive or ejected, depending on media removal is enabled by the Prevent Allow
Media Removal command.
In the case of two partition tape the drive detects that the tape has been formatted as a two partition tape when the
Reference Area is read during the load sequence. When the Unload operation begins the drive will then
automatically update the Tape Log for each partition before unloading the tape.
Power-Fail or SCSI Reset Handling
4.3.3.
If there is a power-fail, the SDX-800V performs the following actions, and reverts to its default configuration:
(1) The drive remains positioned at the point where the power-fail or SCSI Reset occurred.
(2) It executes the Power-Up sequence of self-tests. (When power is restored.)
(3) The drive returns CHECK CONDITION status for the first command after the power-fail or Reset. The next
command from the initiator should be a REQUEST SENSE. The drive will return sense data including a sense
key that will indicate that the drive has been reset. (Sense Key / ASC / ASCQ = 06/29/00)
SONY AIT-3Ex drive SDX-800V series Ver.1.0
(Effective for non MIC cassette, only) Refer to 12.2.1. Fast Media
(Effective for non MIC cassette, only) Refer to 12.2.1. Fast
4.Operation
4-3
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