Wondering, if I ever decide to replace the iBook's (still in the mail) hard drive with a faster 5200 or 7200 RPM drive, will I lose SMS? Is this feature (ie. sensor) built into the harddrive (meaning you'l lose SMS), or is it a separate controller that shuts down the hard drive (meaning you can use any hard drive and keep SMS)? Just wondering. P.S. Who makes Apple's notebook hard drives?