I have learned from a good IT friend that with some connectors and converters, you can use a laptop hard disk to be used for desktop. I guess the method is similar to portable and external hard drive. I am not sure how they do it but I am sure it is possible.
Plenty of cheap and nasty drive enclosures at DX: http://www.dealextreme.com/c/pmp-otg-hdd-enclosures-310