I'm looking to get a new HD for my late-2007 MacBook, and I was looking at a specific HD which is SATA 300. I understand that it's able to go up to 3.0Gb per second, and that my MacBook won't, but is it compatible at all with my Mac, or do I need to find a SATA 150 version? Thanks! EDIT: And what about the other way round? If I buy a 3Gb enclosure, will my old 1.5Gb drive be compatible with it?