Read the rest of the article for the how-to -- and please read the dislcaimer before you start doing something like this to your system! These instructions also assume some Terminal knowledge...]
- Install a new hard drive
- Boot off Mac OS X Install CD #1
- Install a minimal OS on the new hard disk:
- Click 'Customize' when it asks what type of installation
- Uncheck everything but the BSD subsystem box
- This install takes maybe 10 minutes
- Reboot and hold the Option key to get the boot loader menu
- Boot off the new hard disk
- Open a terminal and su to root
- Run the following command: diskutil list:
- Look for the old disk in the output, will probably be disk1
- Next run diskutil enableRAID mirror disk1:
- The disk will disappear from the desktop for about 30 seconds, then re-appear
- At this point, I reboot the system and hold down Option while it reboots
- Now select the old disk to boot from
- Log in and open the Disk Utility app in Applications -> Utilities
- Select the RAID volume and the RAID tab
- Drag the new disk to the RAID
- Click Rebuild:
- Rebuilding usually take 1-2 hours depending on the size of your disk
- Drink a beer as you now have a mirrored boot drive

