Ok, I have a Macbook white Early 09' (February) and apple says that it is a ATA Hardrive which I thought was ridiculous because almost all laptops have SATA Hardrives and some people on the forum talk about replacing there white macbook's hardrive which is a ATA Hardrive with a SATA Hardrive. I want to replace my 120GB ATA HD with a new one , but is it possible to replace a ATA HD WITH A SATA HD?, OR is there no difference? 