When you save work it doesn't save it across the entire physical drive, only across the partition. Bootcamp can actively make a partition without requiring you to wipe the hard drive completely. It just neatly splits it into two partitions, leaving your OS X partition intact.I'm still confused about one thing. Would you have to wipe your drive completley to put bootcamp on it...cause when you save things its spreads over the whole drive, unless its perfectly unfragmented...which I've never seen a windows PC do (never had a mac). And if I do have to wipe it, how do I get all the programs and OS back on?