Scratch media is media that contains no valid data and to which backup data can be written (probably named as an analogy to scratchpad or starting from scratch). With Backup Exec, as with most other backup software products, scratch media is media that is labeled, defined to the program, ready for use and containing no valid data.
As for the second part of your question, short of rewriting the detailed procedures included in the administrator's guide, here are a few different ways to create scratch media:
Erase the media.
Label the media.
Format the media.
Change the overwrite protection period for the media set.
Move the media to scratch media.
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