How do I format and reinstall my MacBook air?

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 choice. Quit out of the Disk Utility app, and this time choose Reinstall OS X and Continue.

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Similarly, you may ask, how do I reinstall my MacBook air?

Step 4: Reinstall a clean Mac operating system

1. Restart your Mac.
2. While the startup disc is waking up, hold down the Command+R keys simultaneously.
3. Click on Reinstall macOS (or Reinstall OS X where applicable) to reinstall the operating system that came with your Mac.
4. Click on Continue.

Additionally, how do I uninstall and reinstall Mac OS Catalina? Restart and Install

1. Use the mouse pointer or the arrow keys on your keyboard to select the disk called Install macOS Catalina in the drive list that appears on the screen.
2. Once the USB drive has booted, select Disk Utility from the Utilities window, choose your Mac's startup drive from the list, and click Erase.

Simply so, will reinstall macOS erase data?

Technically speaking, simple reinstalling macOS won't erase your disk either delete files. You probably don't need to erase, unless you're selling or giving away your Mac or having an issue that requires you to wipe.

How do I do a factory reset?

Factory reset your Android phone from the Settings menu

1. In the Settings menu, find Backup & reset, then tap Factory data reset and Reset phone.
2. You'll be prompted to enter your passcode and then to Erase everything.
3. Once that is done, select the option to reboot your phone.
4. Then, you can restore your phone's data.

Related Question Answers

How do you wipe clean a Mac?

How to Wipe a Mac Hard Disk Drive (HDD)

1. Make sure your Mac is turned off.
2. Press the power button.
3. Immediately hold down the command and R keys.
4. Wait until the Apple logo appears.
5. Select “Disk Utility” from the OS X Utilities list.
6. Select the disk you'd like to erase by clicking on it in the sidebar.

How do I factory reset my iMac?

Restart the Mac in Recovery Mode. Hold down Command and the R key during restart - or use alternative key combination as appropriate (We have a detailed tutorial on using Recovery Mode here). Use Disk Utility to erase the hard drive. Click on Disk Utility > Continue.

How do you master reset a MacBook Air?

How to Reset MacBook Air: Performing a Factory Reset

1. Click Disk Utility.
2. Click Continue.
3. Click View > Show All Devices.
4. Select your hard drive (e.g. "APPLE SSD") and click Erase.
5. In the Format field, choose the APFS option if you're running macOS High Sierra or later.
6. Click Erase.

How do I wipe my Mac before selling it?

Factory reset You need to put your MacBook ($799 at Walmart) into recovery mode in order to erase all of your data and reinstall MacOS. To enter recovery mode, restart your Mac and immediately press and hold Command-R. You can release the keys when you see the Apple logo. Next, you'll see the MacOS Utilities window.

What to do before you sell give away or trade in your Mac?

What to do before you sell, give away, or trade in your Mac

1. Create a backup. Be sure you have an up-to-date backup of your important files and data.
2. Sign out of iTunes on macOS Mojave or earlier. Open iTunes.
3. Sign out of iCloud.
4. Sign out of iMessage.
5. If you're keeping paired Bluetooth devices, unpair them (optional)
6. Erase your hard drive and reinstall macOS.

How do I reset my Mac without command r?

Hold down Command-Option/Alt-R and press the Power button. (On some Mac keyboards the Option key will be named Alt). Hold down those keys until you a spinning globe and the message "Starting Internet Recovery. This may take a while".

How do I restore my MacBook Air to factory settings?

With your MacBook Air powered up, use your AC adapter to plug the computer into an electrical outlet. Then, reset the computer. As the computer restarts and boots back up, hold down the Command and R keys together. This key combination will open up a utilities menu, from where you can restore your system.

How do I reinstall my operating system?

To reinstall Windows:

1. Make copies of all the personal files on your computer.
2. Choose Start→Turn Off Computer→Restart to restart your computer and watch the screen carefully.
3. Press the designated key or key combination.

How do I restore my MacBook?

The most often used way to enter Recovery Mode is this:

1. Click on Apple logo at the top left of the screen.
2. Select Restart.
3. Immediately hold down the Command and R keys until you see an Apple logo or spinning globe.
4. Eventually your Mac will show the Recovery Mode Utilities window with the following options:

What happens when you reinstall macOS?

Reinstall macOS. When you need to reinstall macOS on your Mac, you can install it from Apple using the internet or you can install it from the recovery partition included on the hard drive or flash storage of every Mac. Both ways of reinstalling keep your files and user settings intact.

Does Disk Utility erase everything?

Erasing a disk deletes everything on it. Erasing a volume deletes all the files on that volume, but does not affect other volumes. If you have any files you want to save, copy them to another disk or volume before you erase the disk or volume they are on.

How do I fix a Mac installation error?

Here is how:

1. Restart your Mac, and while your computer restarting, immediately press and hold the Command and R keys until you see the Apple logo, then you can release the keys.
2. macOS Utilities will launch.
3. Select Disk Utility and click Continue.
4. Run First Aid.

Does installing a new OS delete everything?

If you mean, does installing a new version lose data and apps from the old version, no, it does not. It simply upgrades the OS and then optimises your Mac for the new system.

Does recovery mode erase data?

The answer is: Entering Android Recovery will never delete everything on the device. But, Android Recovery has an option that enables you to delete everything and reset the device to factory settings.

Will updating to Mojave delete my files?

The simplest is to run the macOS Mojave installer, which will install the new files over your existing operating system. It won't alter your data, but only those files that are part of the system, as well as bundled Apple apps. Launch Disk Utility (in /Applications/Utilities) and erase the drive on your Mac.

How do I reset my Mac without deleting files?

Phase 2: Reset Your MacBook Pro/MacBook Air/iMac and More

1. Step 1: Reboot Mac in Recovery Mode. Go to Apple menu in the top left corner of your Mac screen and click 'Restart'.
2. Step 2: Erase Mac hard drive. Choose 'Disk Utility' and click 'Continue'.
3. Step 3: Reinstall macOS on your Mac computer.

Where do you find Disk Utility on a Mac?

To access the Disk Utility in macOS, just press Command+Space to open Spotlight search, type “Disk Utility” into the search box, and then press Enter. You can also click the Launchpad icon on your dock, click the Other folder, and then click Disk Utility.

Will reinstalling Mac speed up my computer?

You might need to remove some startup programs, run updates on your system, or clean out your storage drive to fix this issue. But if none of these fixes have an effect, reinstalling macOS can likely help speed up your system. This is especially the case if your Mac is approaching a decade of life.

How do I reinstall Catalina on my Mac?

The correct way to reinstall macOS Catalina is to use your Mac's Recovery Mode:

1. Restart your Mac and then hold down ? + R to activate Recovery Mode.
2. In the first window, select Reinstall macOS ➙ Continue.
3. Agree to the Terms & Conditions.
4. Select the hard drive you'd like to reinstall mac OS Catalina to and click Install.