Fusionsound

Hi everyone, well i was using my Sony Minidisc Deck MDS-JE510 by recording some good mixes. But i've been running into a lot of problems. First i left the minidisc in the deck overnight and erased all my music. Then today i went to record on it, and i keep getting errors with my discs, and i've used 3 different ones. Could it be because i'm using 80 minute discs instead of 74?