Right got you, thanks for that.
When I run the inventory, the application now sees what tape is in the drive, great.
Next issue, when I try to run a backup, the tape that's in teh drive (doens't seem to matter which one) is spat out right at the start and the job stays on "Loading Media".
Pushing the tape back in, just makes it get spat back out again.
I've created a new Media set and added the tape to it. I've also stuck in in scratch media first so that it knows that it can be overwritten but no joy.
I guess I'm doing something wrong here, but can't seem to find out what.