Hi, this is my first post so please forgive me if this question has been answered before. I have an older emachines computer that i don't use at all, and i was wondering if i could take out the internal hard drive and use it as an external for my 20" iMac. I have seen enclosures but am a little confused what i need to get. also, i think i saw enclosures that allowed the hard drive to be used as a network drive. Is this also an option? thank you in advance