How do I restore Read & Write privileges to a hard drive?

I made an error to change it to No Access for the administrator. Now the hard disks are no more on the desktop, and in Disk utility they show as non-selectable documents. How can I restore this? Please don't tell me I've lost my drive!

What happens if you boot from your install DVD and repair your permissions? You could login as 'root' and reset permissions that way.
-Bmer
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How do I restore Read & Write privileges to a hard drive?

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