It's not uncommon for Mac users to have old hard drives lying around the house or office. In most cases, the spare drives are the by-products of a storage upgrade on one or more Macs.
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It's a shame to let these drives collect dust, especially when you can use them to add more storage to your Mac. All it takes is a little of your time, and perhaps a little bit of cash for an external enclosure, if needed.
This guide will take you through the process of testing, erasing, and even stress testing a drive, to ensure that everything is working at its best, and that you're not putting your data onto the platter of a temperamental drive.