Partitioning a hard drive, or an SSD drive, involves creating multiple volumes from one physical storage medium. The volumes appear separately in the Finder and are treated separately by your Mac. You can format them independently and use them for different purposes. You may not know it, but your Mac's boot drive, assuming it's a recent model, is already partitioned. Modern Macs ship with a hidden partition, which hosts OS X's Recovery System, a set of first aid tools and an installer that allows to re-install the OS X on your boot disk if you're unable to boot from it. There are occasions, however, when you'll want to create another partition, and here we'll show you how.
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