Windows 2000 Svr, was running v 9.0 and a dat drive. Upgraded to a Sony 40gb AIT drive, was having a problem getting Veritas to recognize. Did a full reinstall, Veritas found drive, but got error "a0008101 - Invalid Physical Volume Library Argument" whenever I did anything with the drive (backup, inventory, format). Upgraded to 9.1, same problem. We just pulled everything out (including everything in registry) and reinstalled9.1. Same problem. NTBackup works fine. Please help. We have ran out of options.