I'm planning to take out the 500GB HDD of my new late-2011 Macbook Pro and sell it, but what would be the best format option? What I would like is to be able to sell the drive to either Mac or Windows users; in other words, is there like a "universal" format option to erase the disk and make it available to either users? Why i'm asking is because a couple of years ago I tried to sell my early-2008 250 gb stock drive and chose the 7-pass option + Mac OS x (Journaled) if I'm not mistaken. And then I sold it to sb who tried to use it as an external drive but he said he couldn't and couldn't re-format it or get it to work with his configuration. Why? Couldn't you re-format any HDD regardless of its current format? What option should I choose for my current drive then? Thanks.