I receive the following error in the Backup Exec Event log when running a
scheduled backup :

Unable to mount specified medium.
Physical Volume Library User aborted the operation.

Backup Exec is the following version and build :

Backup Exec for SBS ver. 7.0 Build 725

The server is an HP NetServer LC3 with a HP DAT 8i tape drive.

Any help would be greatly appreciated...please cc: any responses to my e-mail
address (mlh@lynxnet.com).

Thank you !!