Summary
OS X works with a variety of disks and storage media, which are accessible from a Finder window's Sidebar and can be visible on the desktop. Because of how OS X writes data to disks, it's important to eject them before you physically disconnect them from your Mac, so you have several methods for ejecting external disks. You also can use them to eject optical discs.
Disk Utility is where you repair, format, partition, copy, and restore disks, as well as where you mount disks that aren't already mounted and where you create disk images.
In some cases, you'll want to take advantage of RAID drives to increase disk speed and reliability for high-performance tasks such as video editing, database serving, and web serving; Disk Utility lets you do that as well.
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