Also, turn to standards bodies such as ISO and NIST for guidance on media selection because it becomes very important down the road in the Disposition Authority document you'll have to create. Remember, there are going to be records you have to maintain that are going to outlive any media that you are using today (name a hard drive that has lasted over 10 years, or an optical or tape format that has lasted that long, other than DAT, and I don't know anyone who has DAT drives in their tape libraries anymore).
The questions that the auditors will ask you is whether or not the media serves the purpose of good faith retention (does it meet the NIST 800-33 guidelines), and how you are going to handle continuing retention through transfer of media, etc. while preserving the integrity of the archive index.
This was first published in August 2004