Apple guy my whole life, but I know nothing about servers/networking etc. Here's what I got and what I wanna do: 1. Old Graphite iMac --> 150Gb external HD 2. New MacBook 3. Wireless router shared with my 4 college room mates. I never use the iMac anymore. I want to be able to access my external HD through it so I can dump downloads, backup homework assignments and keep my music library on. I would either appreciate having the HD completely private so the roomates couldn't get to it. Or partitioned so they can maybe have a few GBs for themselves. Is this remotely (pun intended) possible? Thanks!