Erasing your disk: For most reasons to erase, including when reformatting a disk or selling, giving away, or trading in your Mac, you should erase your entire disk.

Erasing a volume on your disk: In other cases, such as when your disk contains multiple volumes (or partitions) and you don't want to erase them all, you can erase specific volumes on the disk.

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Erasing a disk or volume permanently deletes all of its files. Before continuing, make sure that you have a backup of any files that you want to keep.

How to erase your disk

Start up from macOS Recovery. Then select Disk Utility from the Utilities window and click Continue.
If you're not erasing the disk your Mac started up from, you don't need to start up from macOS Recovery: just open Disk Utility from the Utilities folder of your Applications folder.
Choose View > Show All Devices from the menu bar in Disk Utility. The sidebar now shows your disks (devices) and any containers and volumes within them. The disk your Mac started up from is at the top of the list. In this example, Apple SSD is the startup disk:
Select the disk that you want to erase. Don't see your disk?
Click Erase, then complete these items:
- Name: Type the name that you want the disk to have after you erase it.
- Format: Choose APFS or Mac OS Extended (Journaled). Disk Utility shows a compatible format by default.
- Scheme: Choose GUID Partition Map.
Click Erase to begin erasing your disk and every container and volume within it. You might be asked to enter your Apple ID. Forgot your Apple ID?
When done, quit Disk Utility.
If you want your Mac to be able to start up from the disk you erased, reinstall macOS on the disk.

How to erase a volume on your disk

Start up from macOS Recovery. Then select Disk Utility from the Utilities window and click Continue.
If you're not erasing the volume your Mac started up from, you don't need to start up from macOS Recovery: just open Disk Utility from the Utilities folder of your Applications folder.
In the sidebar of Disk Utility, select the volume that you want to erase. The volume your Mac started up from is named Macintosh HD, unless you changed its name. Don't see your volume?
Click Erase, then complete these items:
- Name: Type the name that you want the volume to have after you erase it.
- Format: Choose APFS or Mac OS Extended (Journaled). Disk Utility shows a compatible format by default.
If you see an Erase Volume Group button, the volume you selected is part of a volume group. In that case, you should erase the volume group. Otherwise, click Erase to erase just the selected volume. You might be asked to enter your Apple ID. Forgot your Apple ID?
When done, quit Disk Utility.
If you want your Mac to be able to start up from the volume you erased, reinstall macOS on that volume.

Reasons to erase

You can erase at any time, including in circumstances such as these:

You want to permanently erase all content from your Mac and restore it to factory settings. This is one of the final steps before selling, giving away, or trading in your Mac.
You're changing the format of a disk, such as from a PC format (FAT, ExFAT, or NTFS) to a Mac format (APFS or Mac OS Extended).
You received a message that your disk isn't readable by this computer.
You're trying to resolve a disk issue that Disk Utility can't repair.
The macOS installer doesn't see your disk or can't install on it. For example, the installer might say that your disk isn't formatted correctly, isn't using a GUID partition scheme, contains a newer version of the operating system, or can't be used to start up your computer.
The macOS installer says that you may not install to this volume because it is part of an Apple RAID.

About APFS and Mac OS Extended

Disk Utility in macOS High Sierra or later can erase using either the newer APFS (Apple File System) format or the older Mac OS Extended format, and it automatically chooses a compatible format for you.

How to choose between APFS and Mac OS Extended

Disk Utility tries to detect the type of storage and show the appropriate format in the Format menu. If it can't, it chooses Mac OS Extended, which works with all versions of macOS. If you want to change the format, answer these questions:

Are you formatting the disk that came built into your Mac?
If the built-in disk came APFS-formatted, Disk Utility suggests APFS. Don't change it to Mac OS Extended.
Are you about to install macOS High Sierra or later for the first time on the disk?
If you need to erase your disk before installing High Sierra or later for the first time on that disk, choose Mac OS Extended (Journaled). During installation, the macOS installer decides whether to automatically convert to APFS—without erasing your files.
Are you preparing a Time Machine backup disk or bootable installer?
Choose Mac OS Extended (Journaled) for any disk that you plan to use as a Time Machine backup disk or as a bootable installer.
Will you be using the disk with another Mac?
If the other Mac isn't using macOS High Sierra or later, choose Mac OS Extended (Journaled). Earlier versions of macOS don't work with APFS-formatted volumes.

How to identify the format currently in use

If you want to know which format is currently in use, use any of these methods: Mac dre dredio mp3 download.

Select the volume in the Disk Utility sidebar, then check the information shown on the right. For more detail, choose File > Get Info from the Disk Utility menu bar.
Open System Information and select Storage in the sidebar. The File System column on the right shows the format of each volume.
Select the volume in the Finder, then choose File > Get Info from the menu bar. The Get Info window shows the Format of that volume.

If your disk or volume doesn't appear, or the erase fails

Shut down your Mac, then unplug all nonessential devices from your Mac.
If you're erasing an external drive, make sure that it's connected directly to your Mac using a cable that you know is good. Then turn the drive off and back on.
If your disk or volume still doesn't appear in Disk Utility, or Disk Utility reports that the erase process failed, your disk or Mac might need service. If you need help, please contact Apple Support.

Learn more

If you can't start up from macOS Recovery, you can use a different startup disk instead.
If Disk Utility shows a Security Options button in the Erase window, you can click that button to choose between a faster (but less secure) erase and a slower (but more secure) erase. Some older versions of Disk Utility offer the option to zero all data instead. These secure-erase options aren't offered or needed for solid-state drives (SSDs) and flash storage.

Overview

Disk Utility is an essential tool in the Utilities folder to reformat or re-partition a hard drive, mount or create a disc image, repair disk permissions or perform other disk “first aid,” in Mac OS X. In El Capitan, Disk Utility was improved with a more colorful edition providing at-a-glance information of how you use your disk. In the new macOS Sierra system, the new design of Disk Utility is still here. And there is more things improved for Disk Utility in macOS Sierra.

Download Disk Utility For Windows

Improvements made to Disk Utility in macOS Sierra

The disk partitioning tool in Sierra is much better than the one in El Capitan, making it easier to tell where the system partition is and how much space is available on the disk. Another improvements made to Disk Utility in macOS 10.12 Sierra is Resizeable Disk Utility. The Disk Utility app in OS X El Capitan cannot be resized. Whether this was intentional or a bug remains unclear, but Apple has fixed this issue in Sierra as the Disk Utility window is once again resizeable.

Disk Utility Missing Feature in macOS Sierra: Repair Disk Permission, and the Solution

The Disk Utility app has long contained the ability to verify and repair disk permissions on a Mac, but in Mac OS X El Capitan, this feature has been removed. And the feature isn’t brought back in macOS Sierra. Since El Capitan, there are some essential changes to the way it handles files. In El Capitan and Sierra, the macOS will automatically repairs file permissions during software updates and changes.

So there is actually no need to repair file permissions any more. Though, it’s still often a useful troubleshooting step for remedy an ailing Mac, it’s a pity that the command line of repair file permissions is has been completely removed from macOS Sierra. If you open up Terminal (Applications > Utilities) and type in:

sudo /usr/libexec/repair_packages –verify –standard-pkgs /

You will get sudo: /usr/libexec/repair_packages: command not found.

Disk Utility Missing Feature in macOS Sierra: Burn CD or DVD disc, and the Solution

Free Mac Disk Utility

Another important Disk Utility missing feature in macOS Sierra is the ability to burn CDs and DVDs from Disk Utility as no Mac now ships with an optical drive.

However, if your Mac has a built-in optical drive, or if you connect an external DVD drive (for example, an Apple USB SuperDrive), you can burn files to CDs and DVDs to share your files with friends, move files between computers, or create backup files. Discs you burn on your Mac can also be used on Windows and other types of computers.

The Solution: Follow these steps to burn a CD or DVD in macOS 10.12 Sierra:

Disk Utility For Mac

Insert a blank CD or DVD disc.
You will see an dialog that asks you what you want to do with the disc.
Choose Open Finder from the pop-up menu.
Open Finder is the default choice unless you’ve changed that default in the CDs & DVDs System Preferences pane.
Your choices are:
- Open Finder: Mounts the blank disk in the Finder
- Open iTunes: Opens iTunes automatically when you insert a blank CD
- Open Other Application: Lets you choose the application to use when you insert a blank CD or DVD disc
- Run Script: Runs a specified AppleScript when you insert a blank disc.
Pick one or click the Ignore button to leave the disk in your drive without doing any of the above or the Eject button to eject the disk.
If you didn’t ignore or eject the disk, if you want to make whichever action you selected the default for future disks you insert, enable the “Make This Action the Default” check box before you click OK.
Click OK.
Your blank CD or DVD mounts, and its icon appears in the Sidebar of Finder windows and on the Desktop regardless of whether your Finder Preferences are set that way. The mounted CD or DVD acts just like any other removable disc, but its distinctive icon tells you that it’s a recordable DVD (or CD).
Drag files or folders.
You can drag the files or folders onto the disc icon in the Sidebar or desktop, or open the disc and drag the files or folders to the disc’s window. Continue adding files or folders until the disc contains all the files you want on it or is full.
Arrange and rename the files
When the disc is burned, the items on the disc have the same names and locations that they have in the disc window. After the disc is burned, you cannot change the items.
click the Burn button
When you’re ready to finish (burn) your DVD (or CD), open its disc icon and click the Burn button (below the Search field near the top right).
Choose a speed from the Burn Speed pop-up menu, click the Burn button, and you’re done.
Select the Save Burn Folder To check box if you think that you may want to burn another copy of this disc someday.

Warning: CD-RW and DVD-RW disks (the RW stands for rewritable) discs rarely work in devices other than your Mac, including CD (audio) players and DVD (video) players. If you burn a music CD or video DVD and intend to watch or listen to it on a device other than your Mac, make sure the disk is a CD-R or DVD-R; NEVER use rewritable CD-RW or DVD-RW disks.

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