I am new to the Minidisc format. I just got a Sony MK II X-4 4-track recorder. I used an old Sony 74min disc that I had left over from film school when I was recording wild sound for my film projects. When I put the disc in it still seemed to have material on it but it was not putting out any audio. I had a monitor hooked up and the volume worked fine but there just wasn't any audio. I tried recording some other stuff but when I played back the disc the time frames were jumping and there was still no audio. Also, whatever I'm recording doesn't seem to be writing to the disc. Every time I write TOC and take out the disc, it reads as a blank disc when I re-insert it into the recorder. Is my disc just old and messed up from being in a box over the last 7 years (or from opening that shutter on accident)? My first inclination is to buy a new disc but I thought I'd check here first. Thanks!