best buy was having a sale on the raptor x ($190), so i decided to pick one up to replace the stock 250GB drive from apple. i want to reinstall osx on the raptor and use the 250GB drive as another scratch disk alongside a 320GB drive. what's the best way of going about this? i don't store anything on the 250GB drive, only apps. many thanks for your help, i don't have any experience with this type of stuff.