I'm looking to upgrade the harddrive on my Macbook. I figure I would get a WD passport so I can put my current drive in there and have an external drive. When I went to newegg.com to look at the drives I see there is 2 WD Passport 320GB drives. One being "Portable" and the other "Essential" http://www.newegg.com/Product/Product.aspx?Item=N82E16822136211 http://www.newegg.com/Product/Product.aspx?Item=N82E16822136227 There is a price difference but what I really want to know if the drive in both of them are the same? If it's the same drive I will get the cheaper one. I've searched around and can't seem to find an answer to my question. Thanks.