SBS 2003 SP2 / DLT compression?

Help ....

For some reason best know to itself our SBS 2K3 server has decided to ignore
the DLT compression - Nothing had been intentionally changed but the maximum
Im now getting from a 80GB tape is 42GB (This used to be 55-60). Im unable
to pinpoint exactly when the problem occured but it was definately before
SP2 was applied.

The DLT drive is an external quantum DLT1 VS80 and the drive passes all the
diag tests using quatums xTalk console.

Im using standard NTbackup configured via the server management tool but
I''ve also tried to backup up via ntbackup directly the results are the
same.

So far I've tried the following :

Cleaned drive / replaced tapes (different brand) / removed & reinstalled
drivers / resceduled for a different time. I've also been lucky enough to
have an identical spare quantum drive, this also maxing out at 42GB, device
manager shows the drive as compression capable and enabled.

Im a little bit stuck - Im aware of software compression issues with Travan
drvies but not DLT. For the time being I've moved the backup onto a USB
drive and its fine, so Im almost certain its compression on the DLT thats
the problem. Anyone have any ideas?

TIA


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