Working with barcode and medias

Hi all,

I have a question about working with medias and barcodes.

1. When I insert in my library a new media, I label that media with the barcode, and the media is labeled with that barcode.

2. Backupexec use that media for backup and when the media is full, the backup operator retires the media.

3. The problem is when we want to reuse that media. We change the barcode and the media takes that new label, but the media is full with the old information.

My question is:

What I have to do for delete the information?

Or maybe Backupexec catalog that new media as a "Scratch Media" and the media it's used and deleted when is needed?

Thanks!