I've decided to sell both of my 2010 Macbooks. I have Windows 7 (W7) and Office 2010 installed via Boot Camp on both units and would like to keep them there when I put them up on eBay. FYI, copies of W7 are legit but were part of the 'family' packs that MS sold. I'm concerned about whether I'll be able to reload the OS if I've wiped the system completely. Is whether there is a way to wipe the W7 side data without wiping the OS? I think newer versions of Windows have that capability, but not sure whether W7 does. Related, is there a way to wipe out data from the OSX side without wiping the entire disk? Appreciate any advice on this. Thanks!