I've been having the same problem almost. I've checked and cables and drivers. My HP burner (8100I) will burn disc and read *most* burned discs but will not read real disks. I have updated drivers, changed aspi drivers, etc. The thing just chokes when I put in a real disc and some burned disks. I have learned that HP only lets you burn to about 68 minutes. It will say that it is burning but when you test it, there is nothing there. Somebody suggested the motor but in that case wouldn't it just not read any discs? I have used Nero, Easy CD creator and a few other pieces of software but the result is always the same. On the burned discs it won't read, the error is "incorrect function" any help would be appreciated.