chmod not working on firewire drive

Dear Y'all - 

I'm having a disquieting experience in which I can't remove write
permission (i.e. "bash$ chmod a-x filespec") on my firewire drive.

I've sudoed to no avail.

Any ideas?

     - Billy

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     William Goedicke     goedicke@xxxxxxxxxxxx            
     Cell 617-510-7244    Office 781-736-4657               
     AIM goedsole
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                - William Goedicke