I have a Sony minidisc recorder, on which I record radio programmes from the internet. However, I think I have pressed something by mistake, and I think it is something to do with editing. when I record now, everything appears to be recording normaly, I can hear stuff going on the disc etc. But when I play it back I only get 20 minutes of play, then the sound goes. it doesnt switch off, and the display still seems active. I have gone through the editing process to try and remove whatever is there by mistake, but it just says sorry. i would be so gratefull if anyone can offer advice.