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Caution: The Tape Log, which contains a history of usage of the tape, will not be updated when the cassette is
write-protected. It follows that the Tape Log becomes inaccurate if a cassette is used write-protected, and the media
warning cannot be relied on to indicate that the cassette needs to be copied and replaced.
4.3. Internal Function
The Load Sequence
4.3.1.
14.2.1 Fast Media Load/Unload (Effective for SDX1-25C, SDX1-35C and TAIT1-40C, MIC cassette)
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-1, 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.
In the case of 2 partition tape the drive detects that the tape has been formatted as a two partition tape when the
Reference Area is read. The drive will then automatically position to the beginning of partition 0 before coming on
-line. Partition 0 is the partition that begins the furthest from BOM.
The Unload Sequence
4.3.2.
14.2.1 Fast Media Load/Unload (Effective for SDX1-25C, SDX1-35C and TAIT1-40C, MIC cassette)
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.
4.3.3.
Power-Fail Handling
If there is a power-fail, the SDX-460V performs the following actions, and reverts to its default configuration:
(1) The drive remains positioned at the point where the power-fail.
(2) It executes the Power-Up sequence of self-tests. (When power is restored.)
(3) If a tape is in the drive, the SDX-460V starts a LOAD sequence. The drive rewinds the tape to BOT and remains
on-line.
(4) 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-1 Turbo drive SDX-460V series Ver.1.0
AIT-E Turbo
AIT-1 Turbo
(Effective for SDX-T3N, TAITE-20N and TAIT1-40N) Refer to
(Effective for SDX-T3N, TAITE-20N and TAIT1-40N) Refer to
4. Operation
4-3
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