How to remount an internal drive as read-write in mountain lion

Suddenly a secondary drive with HFS+ partition changed from read-write to read-only. How can I use the mount command to reverse it in mountain lion?

Try using mount -u -w:

sudo mount -u -w /Volumes/YourDriveName

-u modifies the status of an already mounted filesystem. -w mounts a filesystem as read-write.

The answers in this thread did not work for me, but this did:

  sudo mount -u -o rw /Volumes/VolName

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