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.
Secure Mac Data Erasure Software for Enterprise and Business Users DoYourData Super Eraser for Mac Business gives Enterprise or Business users a complete solution to erase sensitive data from Mac hard drive or storage media. If you want to destroy & permanently erase data under Mac OS, DoYourData Super Eraser for Mac Business is the best choice. SecureErase freespace level device Securely erase a disk or freespace on a mounted volume. Ownership of the affected disk is required. Level should be one of the following: o 1 - Single pass. Sep 30, 2013 Assuming you are taking about the boot drive, then I'm not sure you can, as you need to software on the boot drive to format the boot drive. You could most likely boot from the recovery partition and use Disk Utility to reformat the drive. Question: Q: Format mac hd in single user mode. Safe mode and single-user mode are two of the special start-up modes that your Mac can be powered up to. They’re often used to troubleshoot issues a Mac may be experiencing or to assist in isolating and repairing some common issues that can keep a Mac from starting up correctly, or that make it act strangely when it’s in use.
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.
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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:
- 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.
Macs hold their value very well, and it often makes sense to sell yours to help pay for the new model you are lusting after. Or you may be feeling generous, and you want to hand it down to someone needy. One question comes to mind; how do you secure your personal information? You do not want the new owner to have access to your banking information, browser history and chat logs, now do you? You really do not want to just hand it over as is. This MacTip will guide you through the disk erasing and fresh OS install process, so your can rest assured your data is safe no matter where your old Mac ends up. Following these steps will reset the computer to the “factory” unboxing state for the new owner to setup and enjoy.
Update: Originally published in March 2011, this guide was updated several times to stay current in light of removal of optical disk drives and updates to Internet Recovery. Last updated March 2017.
This guide will walk you though erasing your disk, and re-installing a fresh copy of macOS
Why you need to erase your hard drive/SSD
When you empty your trash bin on your Mac, the files are not really erased. Instead, the reference to the file is removed from the file system (which keeps a list of all the files on your computer), so the computer is able to write new information in the same physical area when space is needed. This is much quicker than rewriting that disk space with blank data, and it also gives you a chance to recover accidentally deleted files with handy recovery software. We recommend erasing the drive with Apple’s Disk Utility keep your personal data safe.
Erasing your storage drive and performing a fresh install using macOS Recovery
![With With](/uploads/1/2/6/4/126472173/975621875.png)
You will need:
- A Wi-Fi network with an active Internet connection
- Time. Budget at least an hour for this process, slower Internet connections and older hardware will take longer.
Let’s begin!
Steps may vary with different version of macOS, and hardware configurations but the general idea is the same. We are erasing a 2014 MacBook Air running MacOS 10.12 Sierra, but the steps will be similar with any recent Mac. We are assuming you already copied all your data to an external backup, or to your new Mac, because the following steps will really erase your disk.
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- Restart your Mac and hold down the following button combination:
Option + Command + R - The computer will begin to boot into the MacOS Recovery mode. The macOS Utilities menu will appear after a few minutes.
- Open Disk Utility to begin the disk erasing process. Select the Internal storage disk in the left-hand menu. It will be called Apple SSD on recent Macs.
- Click on the Erase button at the top of the Disk Utility, this brings up our disk formatting options. MacintoshHD is the default disk name in macOS, disk format required is Mac OS Extended (Journaled), and the Scheme is GUID Partition Map.
- After erasing the disk you are ready to move on to the operating system installation. An Internet connection is required to download a copy of macOS from Apple. Connect to a Wi-Fi network by clicking on the Wi-Fi icon at the top right of the menu bar.
- Now that you are connected to the Internet, click Reinstall macOS in the macOS Utilities menu.
- Follow the install prompts in the installation guide, read and agree the terms and conditions.
- When prompted to select an install disk, select the disk that we had just erased. There will only be one option in most cases.
- The computer will download a copy of macOS from Apple, and install it on the disk. The system download is several Gigabytes in size, therefore the length of time is determined by the speed of your internet connection.
- Once the installation is complete, the Mac will restart and display the factory fresh Welcome screen. At this point your Mac is ready to be handed over to a new owner.
- Unless the new owner is right there already with you, you will probably want to power down the Mac. Press the power button and a dialog box will appear that allows you to shut down.
- Give your beloved Mac a good physical wipe down with some dry cloths, and wave it goodbye.