In case you didn't realize it, fire safes are generally only designed to prevent paper files from burning. I forget--how many hundred degrees for paper to ignite? I'm thinking of that book, Fahrenheit 451. Anything near that kind of temperature can warp and damage CD's.

Anyway, to protect computer media like CD's, floppies, DVD's, etc. the fire safe should explicitly say so. I'm not sure if there are any official standards. AFAIK, safe deposit boxes are not designed to protect computer media either, although the fire suppression systems and just the general environment inside of a vault make heat damage pretty unlikely.