My Mac Pro came with a Sony/NEC AT-7170A CD/DVD writer installed. The only thing I use it for is watching rented DVDs, but lately it fails to read 1 out of 2. I have tested it several times and it's always the same discs that do and don't work, so I don't think it's an optical problem. Neither Sony nor NEC offer's a Mac firmware update, and necflash for Mac, which I only got to work once, did not solve the problem. Fine - DVD readers and even writers are cheap so I'll just get a new one. But I don't know what to get. Pretty much anything will work in a Windows system, but how do I know if a given drive from my local electronics store will work in a Mac? Do they all work, much the same as magnetic media, or is it OS specific? Does anyone have a recommendation? I should add that just a reader is fine - the writer in the one I have works fine and I have two bays.