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.
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.
Jun 01, 2020 macOS Recovery makes it easy to reinstall the Mac operating system, even if you need to erase your startup disk first. All you need is a connection to the Internet. If a wireless network is available, you can choose it from the Wi-Fi menu, which is also available in macOS Recovery. You should see a window labeled OS X Utilities. (Note: if you format your Mac’s internal drive, this will erase all of the data on the drive, including your apps, file, and the operating system.) 2. Dec 06, 2005 I have a Powermac G4 Quicksilver running Mac OS 10.3.9 Panther. I need to be able to update my Java JRE and so I've decided to update the OS to 10.4 Tiger. I would like to reformat my built-in HD where the current OS is running while I'm at it but have never done it before.
How to erase your disk
Select your startup drive on the left (typically Macintosh HD), switch to the Erase tab and choose Mac OS Extended (Journaled) from the Format drop-down menu. Select Erase and then confirm your. Connect the external drive or the USB drive to the MAC. Start the Disk Utility, located under Applications Utilities.
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How to erase a volume on your disk
Reasons to erase
You can erase at any time, including in circumstances such as these:
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:
How to identify the format currently in use
If you want to know which format is currently in use, use any of these methods:
If your disk or volume doesn't appear, or the erase fails
Learn more
Source: iMore
It is that time again. Time to decide whether to keep or replace your Mac laptop or desktop computer. If you are reading this article, chances are you've already come to the decision to replace your Mac with the newes model (or maybe you just got a new Mac as a present!), and you're thinking about selling your old one.
The first thing you should do before hitting the streets to sell your old Mac is clear it of any and all personal data. You don't want to accidentally sell your computer to a stranger when you are still logged into iCloud.
The next step is to reinstall the Mac's operating system so that the new owner can get started without having to figure out how to start up in recovering mode. Believe me, that can be a pain.
If you're going through the process of erasing your old Mac and reinstalling the operating system, we've got some common troubleshooting tips to help you out. Don't forget to follow the additional steps if you're selling a MacBook with Touch ID.
Clean the Mac of your personal data before erasing it
If you're about to sell your old Mac, the one thing you don't want to do is to give away the data you've been storing on it all these years. It's a security and privacy thing for you, but it's also important for the buyer. If you leave behind anything that needs to be logged into with a password, that buyer is going to have to track you down and get your password in order to change ownership. A completely fresh-from-scratch Mac is the best way to do this.
Step 1: Back up your Mac
If you already have your new Mac on hand, you can transfer all of your data from your old Mac or use an older Time Machine backup. If you don't have your new Mac yet, well .. then you probably shouldn't be selling your old one yet. But, if you really don't think you'll need your old computer before getting your new one, just make sure to back up your data so that nothing happens to it before you get what you need onto your new Mac.
Step 2: Sign out of everything
The software you have on your Mac is licensed to you, which means it doesn't get transferred to the new owner of your computer (except the operating system). In order to avoid complications with the new owner attempting to download and install software that is licensed by you, make sure to sign out of everything your personal information is connected to.
How to sign out of iTunes (macOS Mojave and older)
How to sign out of iMessage
How to sign out of iCloud
Step 3: Unpair your Bluetooth devices
If you're keeping your Bluetooth devices, you don't want to leave them paired to a Mac that you're getting rid of. It isn't really that important of a step, but if you sell your old Mac to, say, a roommate or someone living in the same house as you, you may experience accidentally connecting back to it.
Note: If you're unpairing a keyboard, trackpad, or mouse on a desktop Mac, be sure to have a wired one plugged in or you won't be able to type or use a curser and you'll have to repair it all again.
Step 4: Erase your hard drive
Once your data is backed up and you've signed out of everything that might connect your old Mac to your personal information, you can erase everything on it by reformatting the hard drive.
Repeat this process for all data disks under your startup disk. Do not use Delete Volume Group. Once you've deleted all of your data drives, you'll move on to erasing your startup disk.
Source: Christine Romero-Chan / iMore
After you erase your hard drive it will be ready for a clean installation of the operating system. You should already be in the Utilities window after erasing your Mac. If not, restart your computer and hold down Command and R at the same time until you see the Apple logo.
Make sure to reinstall macOS through Recovery Mode, holding down Command+R. You may be asked to sign in with your Apple ID.
If you get stuck during reinstallation, see our troubleshooting section for additional help.
Note: Make sure your Mac is connected to the internet in order to verify the software. You'll be asked to do so during the installation process.
If, while reinstalling macOS, you're asked to enter a password, enter the password you use to unlock your Mac, not your Apple ID.
Your Mac is now clean and ready for a new owner. They will complete the setup instructions to get started using the Mac, as well as download the latest macOS operating system that is available and supported on their Mac.
Troubleshooting erasing your hard drive or reinstalling macOS
I've gotten a lot of very specific questions about issues some readers have with erasing or reinstalling macOS (usually reinstalling). Sometimes, the easiest way to fix issues with reinstalling macOS is to start by holding Shift+Option+Command+R which will put your Mac into an alternate version of Recovery Mode that allows you to install the original macOS that came with your Mac. From here, you can either keep that operating system and let the new owner update to their preferred macOS, or go through the macOS update process.
If, during the macOS reinstallation process, the installer doesn't see your disk or says you can't install the operating system on the disk, you may need to try erasing your hard drive again. Restart your Mac and hold down Command+R to bring up Recovery mode and repeat Step 4.
Since macOS changed to APFS, some readers have struggled with which format option to choose when erasing their disk. Here are some other possible troubleshooting issues from Apple's support document that may help you.
Are you formatting the disk that came built into your Mac?
If the built-in disk came APFS-formatted, don't change it to Mac OS Extended.
Are you about to install macOS High Sierra or later on the disk?Reformatting Hd For Mac Os X Operating System Download
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 with Time Machine or as a bootable installer.
Reformatting Hd For Mac Os X Operating System NamesWill you be using the disk with another Mac?
If the other Mac isn't using High Sierra or later, choose Mac OS Extended (Journaled). Earlier versions of macOS don't mount APFS-formatted volumes.
To learn which format is currently in use, use any of these methods:
If you're still having trouble with either erasing your hard drive or reinstalling macOS, please reach out to us in the forums. We have a wonderful community of Apple users that are happy to help someone in need.
If you're selling a MacBook Pro with Touch Bar
If you follow the steps above, the information stored in the Touch Bar of your MacBook Pro will be securely erased. However, if you've decided to use a third-party program or used Target Disk mode to erase your Mac, you should follow these additional steps to ensure that your Touch Bar data is also erased.
This will clear all the information from your Touch Bar.
Any questions?
Is there anything about resetting your Mac to prepare it for sale that you need help with? Let me know in the comments and I'll get you squared away.
Updated May 2020: Updated for macOS Catalina.
macOS CatalinaMain
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