External hard drives promise almost unlimited storage: for under $100, you can add a terabyte of data to your PC or Mac, portable or desktop. That's enough for over 750,000 MP3s or photos, or over 230 DVD-sized movies. Every computer out there, including compact nettops and netbooks, can connect to at least one hard drive. If you're lucky enough to have multiple input/output ports, you can hook up many more. Auxiliary storage allows you to back up your system files, in case your primary system goes kaput.
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