Reporting and Auditing Tapes

While I am lookin for information I thought I might post a question to the forums.

I am currently doing research on the best way to audit our tapes to see how much each policy is taking up.

I have found information using the command bpimmedia -policy <policy> -L

I have had a number of jobs fail lately and they had to be restarted.

Is there any way to discover what tape the failed jobs are on, if they have any other data on them, and is there a way to delete the unuseable data but maintain the good data?