Lo-and-behold, the macbook drive is slimmer. Also, no warranty on it, but I did get Apple to agree to send me a brand spanking new battery. He gave me one of those silicone keyboard covers and a zippered case for free. The only downside is that the drive is only 80gb. TCP, the Apple drives have apple firmware installed on them to make them 100% boot compatible. Most drives are compatible, but may or may not work with all boot disks/burning options.