Note: Veritas BackupExec and Veritas NetBackup Drivers
If you are using Veritas BackupExec or Veritas NetBackup you should use the device driver that came with your software backup package.
All-In-One Device Driver for PX720
Microsoft Windows Signed Device Driver for PX720 v1.2.1
WinNT Tape Drive Device Driver
Tape Drive Device Driver for Windows NT with DLT1, SDLT220, or SDLT320 tape drives.
Quantum DLTtape Device Driver - Win2k / 2k3 / XP (x86, x64 & ia64)
DLTtape Device Driver for use with DLT Tape Drives in Quantum Libraries.
Quantum Tape Drive drivers can be found on the individual drive download page