I would like to get an iMac, though I am trying to figure out how I can have 2-3 harddrives mounted all the time to the Mac. I currently have a Macpro with 3 extra drives in it (1 just for photos, 1 for video and 1 that gets swapped out for either files or other videos). Are there enclosures that are fast enough to mount 2-3 drives all the time? What do iMac video editors do? Thanks.