Whether you need to better organize your hard drive or resolve disk errors, Disk Utility is the tool for the job. Built into macOS, Disk Utility is tucked away in the Utilities folder, which is found inside the Applications folder, but is easy to locate using Spotlight – which you trigger by pressing Command+Space Bar and then just type Disk Utility. .

The tool displays details and a graph of your hard drive configuration, showing the overall capacity as well as the used and free space and the various volumes.
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