Changed permissions - now I can't access disc

I changed the ownership and permissions on an external drive to 'no access' and now the drive doesn't show up on the desktop. In disc utility the disc icon is white. How can i access the 'get info' section to change it back so i can access the disc?

Careful with Terminal...
Here is what i needed to do for my drive "320GB HD", the last command is just for clean up
Open Terminal and type these commands carefully with the spaces & change 320GB HD to the name of your drive.
sudo chflags 0 "/volumes/320GB HD"
sudo chown root "/volumes/320GB HD"
sudo chmod 1775 "/volumes/320GB HD"
sudo -k
That said, these should be sufficient to do the job:
sudo chflags 0 "/Volumes/320GB HD"
sudo chmod a+rx "/Volumes/320GB HD"

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Changed permissions - now I can't access disc

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