Are you aware that putting mp3s on to a cd does not constitute a standard cd? It will only be playable on cd players that can handle a data disk with mp3 files and even those may have limitations. My cd/dvd player for example can play mp3 but can only play in the order they are on the disk. You cannot jump tracks. Your disk would work fine on a pc and mp3 players.
If the recording are of value, it's best to record in wav and keep those originals. Just convert to mp3s for the disk. When mp3 is outdated, you can convert your original wavs to whatever the new format is.
Starman*
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~ if all else fails, read the instructions