- CDs/DVDs: two to twenty years, varies widely based on use and storage conditions
- Floppy disks: three to twenty years, varies based on storage and brand
- USBs: 10,000 writes
- Hard Drives: 3 years, then 12% annual failure rate
- External Hard Drives: Less time than regular hard drives due to wear and tear
The Museum of Obsolete Media provides Media Stability Ratings for some widely-used obsolete media, which may be of assistance as you assess format risks.
Prioritization Based on Size