SuperDuper from (http://www.shirt-pocket.com/) will make an exact duplicate of the internal small drive contents to the larger external drive and make it boot-able. Then you can switch the two. The iMac you have can probably use up to a drive of 128 GB. On Jan 31, 2007, at 6:46 PM, techlists at comcast.net wrote: > Hello, > > I recently inherited an iMac running OS X (one of those one piece, > round back, blue iMacs). The current hard drive is rather small, > around 10 gigs, slow (I'm guessing 5400 rpm), and making clicking > noises (so it might be getting ready to fizzle out on me soon). > > I have a 20 gig, 7200 rpm drive that I'd like to stick in it, but > don't have install CDs to re-install the OS. I have a USB external > enclosure that I could stick the 20 gig drive in and plug the drive > into the iMacs USB port. Is there a way to transfer the contents of > the existing drive to the 20 gig drive, swap the drives, and have > the new drive be bootable? > > On another related note, is there any limitations on drive size > that can go into this system? i.e. could I stick in a 30 or 40 gig > drive if I had one available? > > Thanks in advance, > > Paul Greene