What's the biggest size SD card that this computer can use? I have the one with the 1.6 ghz cpu, 1 gig of ram and 80 gig drive. Wondering if the SD card is something I can put in my laptop and simply leave there as a backup so I can store all my workcards on it without worrying about losing them if the harddrive goes down. Needs some information on this. Lost my last laptop I was using in a wreck and decided to front the money for a refurbished cf-29 toughbook. Love this thing.