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Compaq Confidential – Need to Know Required
Writer: Debbie McRill Project: Compaq DAT AutoLoader Reference Guide Comments:
Part Number: 326817-003 File Name: e-ch4 Operation.doc Last Saved On: 12/20/99 2:35 PM
Because the forced ejection may interrupt any operation, it is possible
that the drive will not write EOD (End of Data) before the cassette is
ejected. This will cause loss of data, and result in a cassette with an
invalid format. However, it should still be possible to read such a
cassette up to the point where the ejection interrupted the writing.
4.
If no cassette is loaded in the drive, the DAT AutoLoader assumes that
you want to eject the magazine. Following the 35 seconds, it does eject
the magazine. The DAT AutoLoader is then reset as though power had
been cycled.
IMPORTANT:
Forced ejection overrides any SCSI PREVENT MEDIA REMOVAL that may be
in effect, and can abort any SCSI operations in which the DAT AutoLoader is engaged.
Modes of Operation
The DAT AutoLoader can operate in either Stacker or Random mode.
Stacker Mode
In Stacker mode (also known as sequential mode), a cassette can be selected
using the Select and Enter buttons on the front panel. When a cassette is
ejected from the embedded drive after a host UNLOAD command, the DAT
AutoLoader automatically moves the next available cassette from the
magazine into the drive. In this mode the DAT AutoLoader does not depend
on the host computer to send SCSI MEDIUM CHANGER commands to move
cassettes to and from the magazine.
Random Mode
The AutoLoader enters this mode when it receives a SCSI MOVE MEDIUM
command. The Select button is disabled. The Eject button or SCSI UNLOAD
command will cause the AutoLoader to exit this mode.