Quantum superloader not showing in windows device manager

First off, I have to say that I have had nightmares with Quantum tape libraries. It is possible that they are still manufacturing lemons. I had one replaced 4-times and it still did not work!

Start troubleshooting by making sure that it is identified by the controller card it is connected to. You should see this during the server POST before Windows starts. If you don't see it there then Windows definitely won't see it. Send it to Quantum for service.

If the controller sees it then make sure that you are using the Backup Exec drivers. Never use the manufacturer's drivers with Backup Exec. Veritas, now Symantec, has a downloadable utility called the Device Driver Installation Wizard that will make sure you have the correct driver loaded.

I hope this helps.

I agree and would add to the solution to look at scsi cable termination issues.  Some devices can be set to self terminate.  But if not, then I would make sure the bus is terminated correctly.  Again, the logical place to start is at the device / scsi controller card level.

I also agree with JaxPlanet, the quantum tape librarys are very cheaply made.  A px502 portal / magazine LTO3 full height unit jammed on me and I powered it down but the picker was crooked.  We took the unit to a non-quantum service shop and it cost $700 to replace a sensor, and clean the unit! 

My other unit a superloader 3 LTO4 unit can't be manually taken offline or power cycled like the px502 could through the web interface!

lame.  The units work but... and don't get me started on symantec backup exec 12.x.