Cannot create disk image in Disk Utility

I am trying to create a disk image of my macbook pro hard drive to an external firewire drive. The image starts, then I get an error that says "unable to create disk image: Input/Output Error"
I've verified both disks and permissions, but the image creation still fails. I've never had this happen before, and can't find anything about it. Any ideas?
Thanks,
-Jason

Glynn;
You're a genius - THANK YOU!!!!
I just wanted to backup my HD before I upgraded to tiger again .. had my main HD go flakey on me and had to resort to my back up jaguar drive - You're a genius and this worked for me .. as I got the device busy message as well. I figured it was because I was on my start up drive, but didn't have the extra OS drive anymore to switch start up disks to do this.
Thanx so much for your answer!!!
Try this. Open disk utility and highlight your
MacintoshHD(the one you want to copy). In the
options inside the
window(FirstAid-Erase-RAID-Restore) choose restore.
For the source--The Top field--Drag the highlighted
MacintoshHD to the source field.
Destination Field--Drag the image of your lacie
drive(Thats also in the side bar below your
MacintoshHD) to the destination field. click
restore....
g4 Mac OS X (10.3.9)

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Cannot create disk image in Disk Utility

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