Hello. I just purchased my new Macbook Air 13 1.7g. I am migrating from my other computer which is a Win 7 custom PC. I need to get my data off my sata hard drive (500g worth) in the PC to an external HD that I will use on my mac. My problem is that I was told I had to purchase a certain kind of external HD to work with the mac so I purchased a western digital that specifically said it was for MAC in the title. But, how then can I set it up on the PC first to get the data off the original machine? I am at a loss here as I need all of this information. Thanks for any help.