OK, good plan, started a new job, fiddled around with the target device and 4GB in so far so good. I'm not entirely certain what caused all this, although I read on another thread here that reinstalling drivers for Medium changers doesn't always properly update pre-existing job device settings within Backup Exec. Bit unclear on all this, I'm not sure if I'll need to tweak each specific daily job after this, will investigate this more once this backup has completed. Thanks a lot for your help Craig