Hot answers tagged disk-utility
I had the same problem after converting a disk. There was a message displayed by diskutil cs convert: Couldn't unmount disk0s4; converted volume won't appear until it's unmounted I solved the problem by unmounting the disk and repairing it : diskutil unmount force disk0s4 diskutil repairVolume disk0s4
As has been touched on, this seems to be related to Mountain Lion setting itself up for encryption or a restore partition. I found that by selecting the partition table type in Disk Utility to MBR (yuck) instead of GPT or Apple's, this behavior is avoided and one gets the extra ~200MB usable space.
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