Whenever trying to format (brand new media), I get error 529: "Device has detected a media error..." I tried with an older (empty) HP cartridge, and a brand new Sony one (identical model number to the ones previously being used).
Also, when trying to run a backup, it tells me to insert tape with label X. The specific tape _is_ in the drive. I used "Identify Media" to verify (so something is still working).
I'm at a loss of what to do next...