I recently replaced an trevan external SCSI tape library for an internal SCSI LTO2 half-height drive. This new drive is recognized in the bios scsi selector (with all defaults), it is also seen when running tapeinst.exe to install the symantec device drivers. It can also be seen in device manager as a normal functioning device(after installing symantec drivers).
The problem is that neither ntbackup, or symantec backup exec can use this device. Ntbackup still wants to use my 4mm trevan, and symantec just sees nothing altogether. When I go to libraries in removable storage within system management, it is marked as enabled, but has a red X through the device.
I also have a "SCSI Explorer" tool provided by my adaptec 19160 SCSI controller. This program is able to see the tape drive, and perform basic lock, unlock, and eject functions with no issues.