I want to exchange my startup disk. Configuration of Mac Pro: 4 internal HDs: 1TB Seagate (startup disk), 1TB WD, 2TB WD and 100GB Maxtor. I also have an external drive (200 GB) hooked up to the Firewire port. The external drive is currently blank. I might use that for music files storage and maybe pictures as well. I want to use one of the other 3 internal HDs in my Mac Pro as startup disk and I want to clone the current startup disk to one of the other 3. How can I do that with help of Super Duper? Or is it better to use Carbon Copy Cloner? Ive recently run tests with Tech Tool Pro and it looks like the Macintosh HD startup disk will have to be replaced in the near future. So, I want to clone this HD to either the 1TB WD or 2TB WD. Im leaning towards the 1 TB WD, because it wont take as long as the 2 TB WD to like back it up and look up stuff up (I would imagine). Besides the OS and applications I would not store much more on it. Bigger files like for movies, Im planning to store on the 2 TB WD. The 100 GB Maxtor will be reserved for text files and other documents. Currently I only have a disk image of the 1TB WD on my 2 TB WD. My plan is to clone the MacHD startup disk to the 1TB WD (I understand that it will be erase automatically before cloning with SuperDuper). Then I would make that my startup disk. My worry is, will the system boot up from this disk without any problems? Another question I have is, can I use the old MacHD for storage? (I will run backups onto my 3 TB Time Capsule). What happens when this drive fails? Can I restore the backed up files on another drive? Thank you in advance for your help!