EXTERNAL HD PERMISSIONS PLEASE HELP!!!

My Friend Changed Some HD Permissions on His Computer while my HD was connected... Now I don't have permission to access it, and it won't let me change the user permissions, even when logged into root.
PLEASE HELP!!!

Hi DJ Young Dirty;
You might want to find better friends in the future.
Do you have a backup?
As far as your Mac goes are you able to change the permission if you boot with original DVD that came with the Mac?
Allan

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