External drives are a great way to increase a Mac's storage capability without having to perform open Mac surgery. External drives are very versatile, and can be used for backups, to store large libraries of data such, as your ever-increasing iPhoto or iTunes library, or just for general storage.
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You can purchase external drives ready to go, as kits, or as complete DIY projects. In this guide, we'll look at the various types of external enclosures, the interface types, and the reasons to buy ready-to-run or build it yourself.