I've just upgraded my stock 20Gb hard drive in my Cube for a whopping 120Gb, and Carbon Copy Cloner made it absolutely pain-free.
I had to remove my DVD-Rom drive's power and ATA cables, and connect them to the new 120Gb drive (putting it in "slave" mode first), and then I ran Disk Utility to repair permissions on the old disk, and to format and partition the new disk.
Then, I "Cloned" my old drive's OSX partition onto my new drive's OSX partition.
It couldn't be simpler.
After I reconnected the DVD-Rom drive, I then removed the old 20Gb Maxtor, and replaced it with the new 120Gb Seagate Barracuda (not before setting the jumpers back to "Master", of course!).
Now, my drive's TOTALLY silent - AND, I now have a 75Gb Video Scratch disk to work with (that's nearly 6 HOURS of DV video!).
The difference in noise really makes the Maxtor sound like Concorde taking off...
😉