Im thinking of getting a bigger hard drive (500gb WD scorpio blue) for my macbook (mid 2007) and just wondering since i don't have the install disks but I am getting a retail osx leopard, can I clean install leopard in this new hard drive? I know I need to format hard drive first, but i don't want to get an external case to clone my hard drive and fresh install. I want to install the new snow leopard in this hard drive, so it wold be nice to get the process from installing new hard drive with snow leopard.