OS X Disk Utility to Repartition USB External Hard Drive but froze and Force Quit Disk Utility and Now Missing Disk Space

Had to use

fsck_hfs -r /dev/disk1s3 (disk1s3 is EXAMPLE only)

http://joshwink.wordpress.com/2009/08/02/os-x-repairing-an-external-usb-drive-that-wont-mount/

If you have an external USB drive, you have to unmount it first. You can find the name of drive by going to Disk Utility and Get Info on the partition.

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