Just to be picky, it's actually diskutil, which, judging by the title of the thread, ph8tel is already aware of: diskutil repairVolume device is the relevant command.
As long as you're not attempting to repair the boot volume, and assuming the volume in question can be unmounted, diskutil repairVolume unmounts it automatically, just like Disk Utility.
dkmarsh—member, FineTunedMac Co-op Board of Directors
