Disk utility gives "Error: Partition map repair failed while adjusting structures to fit current whole disk size"
I am getting the following error when running Disk Utility (under ML) on an exteral USB hard drive:
Error: Partition map repair failed while adjusting structures to fit current whole disk size.
I get thsi when I ask Disk Utility to "Repair Disk" at the top level of the disk hierarchy (i.e. not on one of the partitions within the disk but on the disk itself). I was not getting this error with Lion on the same disk before I upgraded from Lion to ML.
It seems like a bug in ML. I found websites where they suggest that you just run Lion's Disk Utility and it will show the disk to be fine.
Any thoughts?
MacBook Pro, OS X Mountain Lion