When I copy music files from my PC to a USB external hard drive, some of the files get corrupted and can't be opened. First times this happened I thought it was a faulty hard drive so got another one - exactly same problem. Then I found that the same thing happened when I tried copying music or photo files to a USB flash drive and also to a music player. All the drives work fine when connected to a netbook. Could it be a problem with the USB ports? I've tried using different ports on the PC but always get the same problem. My PC is 5 years old, 2x2.8Ghz Pentium, runs XP and has 2 front and 6 rear USB ports. Anyone come across this and is there anything I can do to solve it short of buying a new PC?