How to identify media that can be re-used?

Hi,

The previous admin has all media with data put in the Netbackup pool. Consequently all media have mixed full and non-full images. I am trying to find a way to identify any media that has only non-full images and are older than 6 months from today. Once identified, I can recycle them for future backups. I've attempted on using vmquery and bpimmedia in my script to sort it out but it does not work quite right. Is there a simpler way to achieve this?

On a related note, to be more efficient, I am hoping to filter out media that are older than 6 months prior to examining the images on them. What's the best way to do this? One criteria I can think of is to use the last mount date/time for the media. Is there a better way to do so?

Thanks!