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How to Format New Hard Diskįormatting a new disk, in the simplest of terms, means setting up a file system in the new drive to work with your macOS. No one needs to tell you formatting your Mac's drive entails reinstalling the macOS afterward, right? As long as you're aware of that, you're good to go.

Apple has given you several options to choose from should you ever need to format or reformat your drive. The simple reason you might want to completely wipe your Mac's internal drive is that it has encountered one serious error or another.