External Firewire Drive locked after installing Leopard

One of my external drives is completely locked with a "could not be opened as you do not have sufficient access privileges" error.
I have tried a few things in Terminal that are suggested for similar problems on this forum but none of them have worked.
I did manage to remove the little padlock icon on the disk with one of these commands but I still cannot even open the disk. The moment I click on it it gives the error.
As this has a lot of important work on it. I would really appreciate it if someone out there could help me.
Regards
Nige

I should mention.
I had some problems installing Leopard whereby my admin account was reduced to a standard account and I couldnt do anything.
I followed instructions on Applesite to reset my account to admin by logging in as root then enabling my account to administer.
Since then everything is OK except for this drive problem.
I ran another terminal thing I found this is the result:
ls -alO /Volumes
total 16
drwxrwxrwt@ 6 root admin hidden 204 2 Aug 06:53 .
drwxrwxr-t@ 40 root admin - 1428 1 Aug 10:57 ..
-rwxrwxrwx 1 mel mel - 82 17 Jan 2008 ._pink camera
drwxrwxr-t@ 34 root admin - 1224 1 Aug 17:56 Jupiter
lrwxr-xr-x 1 root admin - 1 2 Aug 06:52 Macintosh HD -> /
drw-rw-rw-@ 19 nige nige - 714 31 Jul 14:11 Saturn
nigel-grimshaw-jones-computer:~ nige$
Itlooks like Saturn is not administered by admin but by nige who was the admin prior to the new install.
Whew...

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