I recently edited a word document that I access from my cd. Unfortunately, after finish editing I accidentally save it on the original disc. Now it only contains a word document which is around 80kb. Originally, the disc contains documents, midi file, MPEG file and Applications. It is around 500MB. Now the overwritten disc contains 580mb, does this mean, the other file I have before is still on the disc? Is there a way to recover these file?