External drives have long been used for adding more storage space to Macs. They provide a cost-effective means to increase storage for media libraries and documents, as well as backup space. External storage devices are seeing more and more use as primary startup drives, when there’s a need to expand space on the startup, or increase its relative performance over the internal drive that originally came with a Mac. The reason for this is a simple one: Apple has continued to make replacing an internal drive a difficult, if not impossible, task for most users.

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