diskutil

Utility to manage local disks and volumes. Some subcommands such as partitiondisk have their own usage documentation. More information: https://keith.github.io/xcode-man-pages/diskutil.8.html.

List all currently available disks, partitions and mounted volumes:

diskutil list

Repair the filesystem data structures of a volume:

diskutil repairVolume {{/dev/disk_device}}

Unmount a volume:

diskutil unmountDisk {{/dev/disk_device}}

Eject a CD/DVD (unmount first):

diskutil eject {{/dev/disk_device1}}