Reuben Feffer wrote:
How is this "copy procedure" better than restoring iMac B's hard drive from iMac A's Time Machine backup? I really like the idea of using this restore system from backup method, because I've done it before. What's the catch with it?
It's called "cloning" and since you have two identical machines the hardware drivers on A will work on B.
The only thing you might not be able to do is of course clone more data to a smaller capacity drive, so as long as the drives are equal in size, or drive B is greater than drive A (great for upgrading boot drives to larger capacities) you can clone. (make/model doesn't matter)
Time Machine is a image backup method only, it's not bootable and you can't have access, it's for newbies who constantly delete their files by accident, it's better than nothing for them.
Cloning puts the whole OS X boot drive/partition onto another drive and "blesses" it so OS X can boot from it, simply hold option while booting a Mac and you'll get a choice of drives to boot from. You can take a external drive clone to another similar Mac and option boot off of it as well, which should come in handy in your case.
Cloning is easy as pointing A at B and click "clone" and it can auto-update as well on a time schedule of your chosing, if your boot drive fails to boot one morning (they do that) just hold option and boot from the clone and your back in business. TimeMachine can't do that. (I wished it did)
What C.D. Taveras is describing is booting the target Mac in Firewire Target Disk Mode, which makes B look like any other hard drive to A, thus using cloning software like the free Carbon Copy Cloner on A to facilitate the clone directly to the other machines hard drive. Since the two machines are identical in make and model, you can do this.
You need preferably a Firewire 800 to 800 cable for the fastest transfer, but a Firewire 800/400 adapter cable (drops to 400 speeds) or 400/400 works as well, just slower than 800.
If you buy a exteral Firewire 800/400/USB drive, a Firewire 800 cable should be included.
So you can use that cable for the Firewire Target Disk Mode clone from A to B.
Then use the external hard drive as a emergency bootable clone for the two machines although user data on one of the machines will need it's own backup method, likely TimeMachine or another clone. 😉
http://support.apple.com/kb/ht1661
http://www.bombich.com/
By the way, if you got a Bootcamp partition you can use Winclone in OS X to image it to another drive.