"Create" button dim when attempting to setup mirrored RAID in Disk Utility.

I'm trying to setup a mirrored RAID in Disk Utility (v10.5.6) in MacOS 10.4.11 on a PowerMac G5. I've got the System and all of my files on a 500 GB Seagate internal drive and I've added a blank 500 GB Western Digital internal drive to be the mirror. When I boot from the Seagate drive and run Disk Utility, I can follow all of the instructions for setting up a mirrored RAID (except the last instruction):
1) Launch disk utility.
2) Select my boot drive.
3) Click on the RAID tab.
4) Enter a RAID Set Name and select a Volume Format (Mac OS Extended Journaled).
5) Drag a drive or volume to the set. Okay, I actually have a problem here, because if I drag the boot volume or drive to the set, nothing happens (it doesn't appear in the selection box). So I drag the blank volume to the set and it shows up in the selection box.
6) Select RAID type (RAID Slice).
7) Click the "Create" button.
That's the step that I can't complete; the "Create" button is dimmed (grayed out, disabled). My boot drive isn't partitioned (it has just one volume), I've run Disk Utility to repair Disk Permissions before I attempted to set up the RAID, and both drives are formatted as "Mac OS Extended Journaled." The only potential cause I can think of is that the two drives I'm using, though they're both 500 GB drives, are from different manufacturers. I can't imagine that would make a difference though.
Why is the "Create" button dimmed?
Any help would be GREATLY appreciated!
Thanks,
Scott

Hi there,
Thanks for your help!
Your explanation makes sense. I've just recovered from a hard drive failure and although I'd backed up most of the files the night before, I still lost a day's worth of email and several days worth of other files. Mirroring appealed to me because then I'd always have a completely up-to-date copy of everything, but your bad experiences with it give me pause.
Is there another backup strategy you can recommend that would give me really up-to-date backups of my entire boot volume?
Thanks again!
Scott

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>
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Moderator, forums.bombich.com

Restore mirrored set with disk utility

It is possible to create mirrored set of 2 arrays without destroying the data stored in one of the arrays?

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