I own four dreamcast, each of them "died" in the sense that the the lens can't read the discs, I tried to calibrate the laser and it worked for a few months, but now they are useless, I need to replace the lens for a pc cdrom lens, when I get them, but I guess I'd like to try and see if I can mod a dreamcast to play backups out of a harddrive or a flash drive.... Any advise?