How to repair a disk in macOS

A corrupt disk could lead to unexpected behavior. If that corrupt disk is your default drive, the one with your operating system installed, the problem gets progressively worse.

Fortunately, Apple makes it easy to diagnose and (often) repair a disk in macOS with its built-in Disk Utility tool. Here you can find problems that could occur from formatting, directory structure, or any number of other common problems. 

If the disk needs attention, the process could take a while using First Aid, Apple’s repair tool. Make sure you have plenty of time before you start, and a fresh backup wouldn’t hurt either.

(Image credit: Laptop Mag)

1) Click to open the Launchpad on the Dock.

2) Select Disk Utility from the Launchpad.

(Image credit: Laptop Mag)

3) With the hard disk selected, click First Aid.

(Image credit: Laptop Mag)

4) On the pop-up that displays a warning message, click Continue.

(Image credit: Laptop Mag)

5) Read the report and click Done when the process is complete.

(Image credit: Laptop Mag)



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