TS1550 OSX Upgrade (Mountain Lion) turned external drive to "read-only" and now I can not do back-ups on time machine.  How do I fix this?

I recently upgraded to mountain lion, latest version OS and now my external drives are read-only.  They are formatted Mac OS Extended and I have been using one of them for Time Machine.  How do I fix?
Thanks

http://pondini.org/TM/C6.html

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