Mar 18, 2017 If the newer OS X version is blocking you from using the Install Disc, then you will need to startup in Recovery and use Disk Utility to erase the drive. See How to reinstall macOS - Apple Support More Less. Disk Wipe by www.diskwipe.org is a freeware application that will help you securely delete data from your hard drive. Even though Disk Wipe for Mac is not available for download, you can try other similar tools instead. Here is a list of apps that can serve as replacements for Disk Wipe for Mac.
Erase and reinstall macOS Start up your computer in macOS Recovery: On a Mac with Apple silicon: Choose Apple menu Shut Down, press and hold the. On a Mac with Apple silicon: Choose Apple. Nov 29, 2018 Select Disk Utility in the Utilities window. Select your Startup disk (usually found under the name 'Macintosh HD'). Look at the top of the Disk Utility window and click Erase. Select Mac OS Extended (Journaled) from the options that will appear in the popup window. May 14, 2020 Once you enter the Disk Utility, you'll have to select the drive you want to erase. In this case, you'll want to choose Macintosh HD to wipe the entire drive. Then, click the Erase button at the bottom of the window. Note: The Erase option will only appear as a clickable button when the computer is booted up using the command + R keys.
Updated December 2, 2020: added information for new Macs with Apple processors.
All too often I've seen people buy a used Mac only to find that the seller did not properly erase the Mac first. Sellers sometimes just delete their documents, leaving poorly configured and obsolete apps lying around. Or worse yet a malicious security threat or connections to their old account. Here is how to properly erase a Macintosh, ensuring that:
- If you are selling or recycling your Mac, none of your personal information remains
- If you are buying a used Mac, none of the previous owner's configuration will mess things up
Take note of what system version you are running, as some of these instructions will vary depending on the version. You can find that in the Apple menu > About This Mac.
Back up any data
These steps will completely and irrecoverably erase everything on your Mac. If you have anything on this Mac that you want to keep you'll want to back it up. Photos, contacts, documents, application installers, etc. Many of these things are saved to iCloud but not necessarily. When we are done the only thing left will be a squeaky clean computer as good as from the factory.
Update your software (optional)
If the computer is going to be reused or sold, you probably want to upgrade the software to the latest supported OS if it isn't already. It's better to do an upgrade and then erase rather than an erase and then upgrade. If you're planning to simply recycle the computer it doesn't matter so you can skip this.
You can view my reference chart to see what version of macOS you can run, and where to get each version.
Log out of your accounts
This isn't strictly necessary but it will remove one of your five allowed iTunes authorizations and will remove the computer from your iCloud account. In particular, you'll want to:
- Deauthorize iTunes. Instructions are the same for the Music app in macOS Catalina. You only need to do it for Music or Apple TV, not both.
- Log out of iCloud (in the Apple menu > System Preferences > iCloud), if prompted you can delete the local data, since you have all of this in iCloud already.
- Log out of iMessage (open iMessage, click the iMessage menu, click the Accounts tab, click the iMessage account on the left column, and then click the button to sign out)
- Log out of FaceTime (similar to logging out of iMessage).
- Deactivate any third party software that has a limited number of authorizations. Most consumer-grade software doesn't do this, but some expensive professional software does. Instructions for this will vary depending on the specific software.
Start up in macOS Recovery Mode
Be sure to remove all devices from your computer except for necessary items like the mouse and keyboard. You don't want to accidentally erase an external hard drive.
For macOS 11 or higher with an Apple processor
- Turn your computer off
- Press and hold the power button until you see icons
- Click the Options icon then click Continue
For macOS 10.7 or higher with an Intel processor
- Turn your Mac off
- Press the power button to turn the Mac back on and immediately press and hold the Command + R keys on your keyboard
- When you see the Apple logo or globe you can release the keys
- Follow any prompts such as entering your WiFi password or choosing your language
Shortcut: If you are running macOS 10.13 High Sierra or later and you want to install the latest OS your computer supports rather than the currently installed OS, use Command + Option + R instead. You can release the keys when you see the globe, then choose your WiFi network when prompted.
For Mac OS X 10.6 and lower
You'll need to boot using a Mac OS X disc. If you don't have your disc you may need to upgrade the system software to a newer version first and then try again. Or you'll need to enter Target Disk Mode and connect it to another Mac to erase with Disk Utility.
- With the computer powered on, insert your Mac OS X install disc or the recovery disc that came with your Mac
- Turn off your Mac
- Press the power button to turn the Mac back on and immediately press and hold the Option key on your keyboard
- Release the Option key when you see the boot selector
- Use your arrow keys on your keyboard or your mouse to select the install disc (it could take up to a minute to appear)
- click the arrow below the install disc or press Return on your keyboard to activate it
Erase your disk
For Macs with an Apple Processor
- Use the WiFi icon in the upper right corner of your screen to connect to WiFi if you are not already
- Click the 'Utility' menu on the top of the screen and choose 'Terminal'
- In the terminal window type resetpassword and then press return
- Click on the new window that pops up
- Click the Recovery Assistant menu
- Click 'Erase Mac…' and follow the prompts to erase your Mac
For Macs with an Intel Processor
- Once in Recovery Mode, click the Disk Utility from the menu and then click 'Continue'
- If running macOS 10.15 Catalina or 11 Big Sur you will see two similarly named drives on the left column, one with 'Data' on the end. Click the Data drive to highlight it, then click the Minus Volume button above to remove the volume. Choose 'Delete' (not Delete Volume Group). If you aren't running Catalina or if you only see one internal drive skip this step.
- Click to highlight your hard drive name on the left column, Macintosh HD by default. If you are running macOS 10.12 or lower it will be indented slightly behind the model name of the hard drive.
- Click the Erase button. Depending on your OS version this will either be on the top button bar or on a tab to the right.
- If you want to destroy sensitive data, click the 'Security Options' button and choose the level you want to run. Each pass takes about two hours depending on the speed of your drive. A single pass is good enough for most people. But consider more if you have any highly sensitive data. If you have an SSD or Fusion Drive you may not have this button because a standard erase is far more destructive.
- If the Format is listed as APFS, leave it as is. Otherwise make sure it says 'MacOS Extended (Journaled)'.
- Click Erase and wait for it to complete. Erasing an SSD or an insecure erase takes just a few seconds. A secure hard drive erase can take hours. If it fails pretty much immediately just try again. Sometimes it takes a couple of tries. If it runs for a long time and then fails, you may have a bad hard drive.
- Click OK after it has finished.
- Close Disk Utility with the red dot button.
- Press Command-Q to shut down if you are just disposing of the computer, otherwise continue on to install the OS.
Install the OS (Optional)
If you are only recycling the computer and don't need to prepare it for another user you can skip this step and shut down your computer by pressing Command-Q.
- Make sure you are connected to your WiFi network by clicking the WiFi icon in the upper right corner of your screen.
- Click the button to reinstall the OS and follow the prompts.
- After the OS is installed you can either go through the account creation process or, if you are selling the computer to someone else, press Command-Q to quit and shut down. The next time the Mac is turned on the new user will be greeted with the same welcome screen.
Requirements
- Fast internet connection: this will download the OS from the internet. It usually takes 30 to 60 minutes on a cable or fiber connection, or it could take 6 to 12 hours on a DSL connection. The download is about 6 to 8 GB.
- For macOS 10.11 or earlier, the currently installed OS must already be in your Mac App Store account. Check this in the Apple menu > App Store > Purchased. If the currently installed OS is not on your purchase list you must upgrade to at least macOS 10.12 and then do the full erase, or solicit the account of someone who does have the currently installed version in their account.
- Compatible network connection: Most home and small business routers since about 2005 should have the appropriate configuration by default. If you are unsure click the WiFi icon in the top right corner of your screen while holding the 'Option' key. In light grey lettering you will see your current security type. Or just try it and see if it works.
You must be on either:
- wired ethernet connection,
- WiFi connection without a password, or
- WiFi connection with WPA-Personal or WPA2-Personal encryption.
You cannot install via:
- captive WiFi connection (one where you get a popup on connecting such as at a coffee shop or library),
- WiFi with WEP encryption
- WiFi with WPA-Enterprise encryption
- WiFi with certificate-based encryption, or
- a connection that requires a proxy to be configured.
Further help
If you are an existing customer who needs help with this or if you have other questions, or if you are in San Francisco and interested in becoming a client I invite you to book an appointment with me. Otherwise, you may wish to contact Apple Support or to find a local Apple consultant.
Photo by Kim Gorga on Unsplash
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macOS Big Sur 11 is the biggest update for Apple Mac operating system. If you are looking for a solution to formatting hard drive or memory card, USB flash drive etc on macOS Big Sur, you've come to the right place. In this article, we will show you three methods to help you easily and quickly format a hard drive or external device after upgrading macOS Big Sur, meeting the various needs of format.
Method 1. Format hard drive or external device with Disk Utility.
Disk Utility is a built-in disk management tool in macOS including macOS Big Sur. Just open it on your Mac, then select the hard drive or device you want to format and click on Erase button. This tool will help you securely and easily format the hard disk drive or memory card, USB flash drive, portable hard drive on macOS Big Sur. However, the formatted data is still can be recovered by data recovery software.
You don't need to install third-party disk formatting software. Disk Utility can meet the normal format needs of you. Disk Utility even can help you format a corrupted memory card, USB flash drive.
Method 2. Format and wipe hard drive with AweEraser.
As said above, the lost data can be recovered even the hard drive has been erased by Disk Utility. In some cases, you need a solution to permanently wipe your sensitive data. For example, before you sell or donate a portable hard drive, you'd better permanently erase all your private files in the portable hard drive to prevent potential data recovery.
AweEraser for Mac is a powerful data erasure application for macOS including macOS Big Sur. You can use this application to format and wipe your hard drive to securely and permanently erase all your sensitive data.
- Once your data is erased by AweEraser for Mac, the erased data is gone forever, can't be recovered by any data recovery software.
- The erasure process is 100% safe, will not cause any damage to your HDD, SSD or external device.
- Certified data erasure methods, such as: HMG Infosec Standard 5, Baseline, DOD 5220.22-M, U.S. Army AR380-19, Peter Gutmann's algorithm.
Now, you can follow the steps below to format and wipe hard drive on macOS Big Sur:
Step 1. Download and install AweEraser for Mac on your Mac computer, then run it from Launchpad.
Powerful and easy-to-use data eraser & junk cleaner software for macOS Big Sur.
Step 2. Select data erasure mode - Erase Hard Drive, this mode will help you format the hard drive and permanently erase all data from your hard drive.
Step 3. Select the target hard drive, then click on Erase button. Once the process gets finished, all data on the hard drive will be gone forever, can't be recovered by any data recovery method.
This disk formatting method will help you format and wipe your hard drive. So, before you sell, donate or trade in your Mac/Device, you can choose this method to permanently erase your sensitive data so that nobody can restore your private information.
AweEraser for Mac also can help you shred files on macOS Big Sur, wipe free disk space, uninstall unwanted applications, clear web browsers' cookies, fix corrupted memory card, USB flash drive, etc. Ez7z for mac.
Mac Os Wipe Disk
Method 3. Format hard drive with AweCleaner for macOS Big Sur.
AweCleaner for Mac is a junk cleaner & disk management tool for macOS Big Sur. It offers a disk manager tool to help you quickly format hard drive or external device. Like method 1, the formatted data also can be recovered by data recovery software.
Mac Os Disk Image Download
Just open AweCleaner for Mac > choose tool ‘Disk Manager' > Select the hard drive > Click on Format button > the selected hard drive will be quickly formatted to exFAT, HFS+, etc.
We highly recommend AweCleaner for Mac to macOS Big Sur users as it is an excellent disk cleaner & optimization tool. It can help you quickly remove junk data, uninstall unwanted applications, manage your Mac after upgrading to macOS Big Sur.
All-in-one Mac cleaner & manager to optimize, clean and speed up your Mac in easy way.
Mac Wipe Disk
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