Disk imaging is a highly useful tool if you're wanting to create a whole copy of a volume and restore it back at a later date, either to the same disk or another one entirely.
Mac OS
In the first part of this series, we explored the basics of disk and partition management via the command-line. Next, we'll see how we can perform disk partitioning as well as how to split, merge and erase ones created.
Disk Utility within Mac OS X provides a range of disk management tools, from erasing and repartitioning hard disks to restoring images and repairing volumes. It's a simple way of interacting with attached storage on your Mac.
Du kan använda en extern enhet eller en andra volym som startskiva för att installera om operativsystemet på din Mac.