# diskutil
# Utility to manage local disks and volumes (Mac OS X)

# List all currently available disks, partitions and mounted volumes:
diskutil list

# Repair the file system data structures of a volume:
diskutil repairVolume /dev/diskX

# Unmount a volume:
diskutil unmountDisk /dev/diskX

# Eject a CD/DVD (unmount first):
diskutil eject /dev/disk1