How to use Disk Utility on a Mac

Disk Utility is an app that comes together with your Mac. It’s tucked away within the Utilities folder, which is contained in the Applications folder, however, is simple to find with Spotlight, which you activate by urgent Command + Spacebar. Here’s what you possibly can use Disk Utility for:

  • Disk utility is used to erase, format or handle inside disks and exterior storage units.
  • Disk Utility may also be used to add and handle volumes, or to partition your date.
  • Disk utility will be helpful when working with RAID units. Combining a number of disks into a RAID set that acts as a single disk can enhance efficiency, reliability, and space for storing.
  • You can use Disk Utility to create a disk picture of files that you really want to transfer, archive, or again up to 1 other computer.
  • Disk Utility is used to diagnose and repair issues with a disk or broken volumes.

Disk Utility was overhauled in Mac OS X El Capitan when it acquired a redesign and lots of the options advanced or have been eliminated.

There are additionally a few modifications in macOS High Sierra thanks to the new file format Apple launched: APFS (more on this beneath).

Why use Disk Utility

You might want to use Disk Utility when you expertise the next:

Your computer doesn’t begin up. (Read: Fix a Mac that will not flip on).

An exterior system doesn’t work. (Read: How to entry an exterior drive that isn’t displayed on a Mac).

  • Your apps stop unexpectedly.
  • You have a broken file.
  • You should mount, unmount, or eject a disc.
  • You should change the file system – for instance, to allow or disable journaling.
  • You assume the re’s a downside together with your startup disk.
  • You should restore a broken disk.
  • To erase, format or partition a disk.
  • Disk utility was used to confirm and restore permissions, however, not crucial since El Capitan.

How to find out in case your disk is flawed with Disk Utility

If you assume the re’s a downside with the disk in your Mac or an exterior storage system, you possibly can use the First Aid feature in Disk Utility to check.

The First Aid perform in Disk Utility will carry out a number of checks and if it detects a downside together with your disk it’s going to repair it.

Note: Disk Utility had a minor makeover in OS X El Capitan and as a end result, the best way you get better a disk has modified considerably. The steps to take rely on the model of MacOS you’re utilizing. We assume you’re utilizing a model newer than El Capitan since that model of Mac OS X launched in September 2015.

Here’s how to run First Aid on your Mac to check for a downside together with your drive:

  1. Open Disk Utility.
  2. Select your system you are having points with within the sidebar.
  3. Click on First Aid.
  4. Disk Utility checks the partition playing cards on the disk and checks every quantity. If you’re working First Aid solely on a quantity, Disk Utility will solely check the contents of that quantity.

If a downside with the disk is discovered, Disk Utility will strive to repair it.

If Disk Utility tells you that the disk or quantity is about to fail, again it up and change it. Disk utility can not repair it.

If Disk Utility stories that the disk is OK, it means there isn’t a downside with the disk.

Repair a disk with Disk Utility

How you restore a disk relies upon on whether or not it’s your Mac’s startup disk (the disk that your Mac runs on, the place the working system is put in), or a person disk linked to your Mac. If it is your startup disk, go to the subsequent part.

  1. Open Disk Utility (in Applications> Utilities or cmd + area Disk Utility).
  2. Select the amount on which you need to carry out First Aid. This may very well be an exterior arduous drive (if it’s your personal Mac arduous drive you’ve got to leap to the subsequent part).
  3. Click on First Aid.
  4. Click Run. This begins the verification and restore course of.
  5. When Disk Utility has been run, checks are carried out and also you see a drop-down record with the standing. You can click on on the triangle on the backside to see more info.
  6. If no errors have been discovered, you will note a inexperienced check mark on the high of the drop-down sheet.
  7. If there have been errors, Disk Utility will strive to repair them. (In older variations you had to manually select Repair Disk).

If Disk Utility can not restore the disk or thinks the disk is sort of faulty, you may be warned. Should this be the case, again up your files earlier than it is too late. Read this article about backing up your Mac.

You may find this convenient: Recover and delete files from a failed arduous drive, SSD, or exterior drive.

How to restore your startup disk / startup disk with Disk Utility

You can run First Aid on your startup disk as above, but when Disk Utility finds errors, it will not strive to repair them.

If you want to restore your Mac’s startup disk (the boot quantity), you possibly can’t do that as a result of Disk Utility can not restore the mounted quantity (the amount that every part is working on). In older variations of Disk Utility, you’ll find that the Repair Disk choice is grayed out.

In this case, you want to boot your Mac into restoration mode and restore the disk from the re. This means, issues will be run from the Recovery HD quantity created when macOS was put in. (Note that when you have a Fusion Drive, issues are even more complicated).

  1. To begin in restoration mode, press cmd + R if you begin up your Mac. We have a detailed tutorial on how to use restoration mode right here.
  2. Once your Mac boots up, you will note a Utilities display. Choose Disk Utility.
  3. Select the disk you need to get better from the menu and click on First Aid. As above, Disk Utility will run its checks and take a look at to repair it if doable.
  4. The restore course of could take a whereas.

How to restore disk permissions

When Apple launched El Capitan in 2015, it eliminated the power to restore disk permissions.

Deleting the feature in all probability signifies that restoring permissions hasn’t actually finished a lot good.

It remains to be doable to restore permissions with Terminal, however, we’re not going into that right here, following Apple’s and assuming it will not do any good and presumably trigger more issues.

However, if you’re utilizing Mac OS X Yosemite or earlier and the permissions of a file are not set appropriately, software program utilizing the file could not work appropriately. If so, do the next to right the permissions:

  1. Open Disk Utility within the Utilities folder of your Applications folder.
  2. Select the startup disk from the record of volumes.
  3. Click on the First Aid tab.
  4. Click Check Disk Permissions to check the permissions. Click Restore Disk Permissions to restore permissions.

How to Create a Disk Image with Disk Utility

Disk Utility can create a disk picture of the contents of a folder which you’ll then switch to 1 other Mac, an archive or 1 other location that doesn’t settle for folders.

It is comparable to compressing the folder into a zip archive, however, the benefit is you could not solely use disk impression to save area, but in addition benefit from Apple’s encoding for the disk picture.

Follow these steps to create a disk picture utilizing Disk Utility.

Format a disk with Disk Utility

There are a variety of the reason why you need to format a disk. You might want to erase your startup disk to be able to do a contemporary install of OS X, it’s your decision to encrypt an exterior storage disk that you just use to your work, or it’s your decision a partition for Windows or 1 other model of the Mac working system.

We have a step-by-step guide to formatting a drive on Mac right here.

Troubleshoot an exterior drive

Here’s what to do when you plug a arduous drive or flash drive into your Mac and do not see it and do not provide you with entry to the info: What to do if a arduous drive will not mount.

Partition a disk

You might want to partition a disk if you need to install a number of working techniques. How you partition relies upon on whether or not you are utilizing High Sierra or an earlier model of macOS or Mac OS X. Here’s how to partition a disk:

We have a guide on how to partition a Mac right here. Plus, this is what you want to do to repair a Blue Screen of Death on a Mac.