Existing CD/DVD drive doesn't recognize DVD media after installing DVD-RW+/- in separate bay. Both are on the IDE (ribbon). Existing CD/DVD drive is set to "Slave" and the DVD-RW+/- is set to "Master". OS XP Home. Sony tech says this is a common problem and that I can't have both the CD/DVD drive and the DVD-RW+/- hooked up to my computer internally. He suggested I purchase an external DVD writer. Any ideas on how to make what I have work?