[KarmaKiller]

Pretty sure you can't. Although, I don't currently own one.....yet
But they use solid state hard drives. Which are really pricey for the amount of space it offers. Your best bet would to be get an external drive, and keep all the "storage" data on there.
If you want to get real fancy, get a external network HDD. So you can remote into it from school, and still have access to all of your data.

Good luck