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I messed up the filesystem on a thumb drive by removing it from the machine before it was ready to remove. Now whenever I insert the drive it comes up "read only." There's probably a permanent fix for this, but for the moment a noob workaround is to get it into "read-write" state with the following command:
sudo mount -o remount,rw '/media/0000-0001'where '0000-0001' is the device name as it appears in the /media directory.