Be careful. The iMac won't boot from the USB drive. You may need to delicately figure out a stratagy for getting the files over to the drive you actually intend on installing in the iMac. I assume you are running Panther which comes on CDs, and is pretty inexpensively purchased. Jens Jens Selvig ...lost in Montana... lstnmt at bresnan.net On Jan 31, 2007, at 8:15 PM, Thomas Noel wrote: > 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