Partitioning your drive is a good way to organize things and segregate certain files and applications, forcing them to use a different logical drive than the operating system.
Disk Utility is also a disk repair tool. Using the First Aid option, you can address problems with your hard drive and potentially repair a damaged or corrupted disk.
First, you have to start the utility. Upon opening Disk Utility you are presented with a view of the drives that are currently attached to your system. Internal and external drives are listed separately. The View drop-down in the top left corner lets you view all devices or just the logical volumes. Select a volume or device by clicking on it to obtain information about your selection. You will see the currently used and free space on the disk as well as its capacity, mount point, type of drive, and the file system used on the disk.
The options are:. A volume option is also on the top of the menu and allows you to add or delete volumes to a container if available for your selection. Care needs to be taken when formatting disks. An inadvertent format of the wrong disk can cause some serious problems and data loss, so proceed with caution.
One of the main uses of Disk Utility is to repair a disk. You will want to perform this task if your hard drive is experiencing problems such as slow access time or missing and corrupted files. Follow this procedure to repair a disk.
Hopefully, after running First Aid, your disk problems will be resolved. If not, you may need to engage in further investigation. Disks that appear in the listing of available devices are normally already mounted. You will be able to Mount or Unmount the disk based on its current state.
These options are on the top menu and are only highlighted when the command can be used on your selected disk. Disk Utility can also be used to restore a disk from another connected disk. The restore function destroys all data on the destination disk so should be used with caution. This will show all the disks, containers, and volumes connected to your Mac in the sidebar on the left.
Containers and volumes appear nested inside each disk in the sidebar. When repairing a disk on your Mac, you need to start by repairing all the volumes inside it first, then containers holding those volumes, and finally you can repair the disk itself. But on occasion, First Aid might spit out a list of unfixable errors with your Mac disk instead. Shut down your Mac and unplug all the unnecessary accessories, then test the cable and port for your drive using a different device before trying to repair it again.
If that fails, try using a different cable, port, or even a different Mac. Here are some of the most popular disk repair apps available:. This might be the result of liquid damage or a hard knock, but disks can also stop working as they age over time. Book an appointment at your nearest Apple Store or with an Apple Authorized Service Professional to diagnose your problem and find out your options.
With over 5 years of supporting Mac users, Ruslana lives and breathes everything Mac. Tech expert, Apple lover, and well, a cutie. Say hi on LinkedIn! Oops, something went wrong. Got a Mac system error? We use cookies to create the best online experience. Check our Cookie Policy for details. Mac Fixes. By Ruslana Lishchuk. What is Disk Utility First Aid? How to repair disk on your Mac with Disk Utility At its essence, Mac disk repair is as simple as opening the Disk Utility application, selecting a disk, and running First Aid.
In that case, follow these steps:. However, if your Mac doesn't start up all the way, or you want to repair the disk your Mac starts up from, open Disk Utility from macOS Recovery: Determine whether you're using a Mac with Apple silicon , then follow the appropriate steps: Apple silicon : Turn on your Mac and continue to press and hold the power button until you see the startup options window.
Click the gear icon labeled Options, then click Continue. You may be asked to select a user you know the password for. Select the user, then click Next and enter their administrator password.
If there is no Run button, click the Repair Disk button instead. If the button is dimmed and you can't click it, skip this step for the disk, container, or volume you selected. If you're asked for a password to unlock the disk, enter your administrator password. If Disk Utility found errors that it can't repair If Disk Utility found errors that it could not repair, use Disk Utility to erase format your disk.
If your disk doesn't appear in Disk Utility If Disk Utility can't see your disk, it also can't see any containers or volumes on that disk. In that case, follow these steps: Shut down your Mac, then unplug all nonessential devices from your Mac. If you're repairing an external drive, make sure that it's connected directly to your Mac using a cable that you know is good.
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