I have a 80GB hard drive that I have had hooked up to a computer and running almost 24/7 for almost two years. I have about 7,000 music files and recently about 200 of them have dissapeared. The hard drive is about half full, 30GB of music 8GBs of other documents and files. So far I only can see that music files have dissappeared. I think it might be a hardware malfunction. The files are not in the recycle bin, and they are not 'hidden'.
Please let me know what you think.