How can i change custom permissions on a drive?

I have screwed up my permissions on 2 of my external drives,  VERY important info on both.
The disk icons have a small lock in the corner and I cannot read or write to them. 
Get info brings up a permissions window that says "Custom"  where the read write should be. 
It will not let me change these.  Please help!

Open Terminal in the Utilities folder. At the prompt enter:
sudo chown root:admin
Put a space after "admin" then drag the Desktop icon of one of the external drives into the Terminal window. Press RETURN. You will be prompted for your admin password. It is not echoed to the screen. Press RETURN again. Enter the following command in the Terminal window:
killall Finder
Press RETURN.
If this works OK then repeat for the other drive. If it does not work then download BatChmod and use it to fix the permissions on the external drives.

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