Hi there, I recently bought a new computer and was encouraged to buy an external enclosure to transfer my files. I thought it sounded simple but I took my old hard drive out (at least I think it was my hard drive!!)and it doesn't seem to fit in the enclosure. I realize I am not a techie but at Best Buy they said it was easy!Anyone who could explain a) what a hard drive looks like (just so I am sure I have the right piece of equipment and b) how to fit it in an enclosure. the one I bought was ESATA 11 3.5" Will be eternally grateful!