Quick Answer: How Do I Wipe My Mac And Reinstall?

Does reinstalling Mac delete everything?

Reinstalling Mac OSX by booting into the Rescue drive partition (hold Cmd-R at boot) and selecting “Reinstall Mac OS” does not delete anything.

It overwrites all system files in-place, but retains all your files and most preferences..

How do you restore a Mac to factory settings?

How to reset a MacBook Air or MacBook ProHold down the Command and R keys on the keyboard and turn on the Mac. … Select your language and continue.Choose Disk Utility and click continue.Choose your startup disk (named Macintosh HD by default) from the sidebar and click the Erase button.More items…•

How long does it take to wipe a Mac?

I found one estimate, based on a test with a 500 GB External Drive connected with Firewire 800, which took 18 hours 22 minutes for a 7-pass erase, yielding an estimate of 0.314 minutes per GB. My 640 GB drive might then take nearly 24 hours. At that rate, even three passes would take over 10 hours.

How do I reset my Mac without losing everything?

Phase 2: Reset Your MacBook Pro/MacBook Air/iMac and MoreStep 1: Reboot Mac in Recovery Mode. Go to Apple menu in the top left corner of your Mac screen and click ‘Restart’. … Step 2: Erase Mac hard drive. Choose ‘Disk Utility’ and click ‘Continue’. … Step 3: Reinstall macOS on your Mac computer.

Should I clean install Mac OS?

Why a clean install of macOS Catalina is good Everything is new and you get to decide where to put the furniture. You can make your new home similar to your old one or completely redesign your living space. It gives you the opportunity to rid your Mac of unnecessary bloat.

Does reinstalling Mac OS remove malware?

Yes, it’s the same. Clean install Mac OSX from the scrach with Install Disc which came with MacBook could delete malware or the like.

How do I clean out my Mac?

You can quickly clean up your Mac with these easy steps.Clean up cache. You’ve probably heard “Remove your cache” as a web browser troubleshooting tip. … Uninstall apps you don’t use. … Remove old Mail Attachments. … Empty the trash. … Reduce clutter. … Delete large and old files. … Remove old iOS backups. … Wipe out Language files.More items…•

Why can’t I erase Macintosh HD?

If you’re trying to reformat or erase the startup disk on your Mac, you need to boot into Recovery Mode first. The startup disk is the main hard drive on your computer: the one that stores macOS and all your data. It’s not usually possible to erase the startup disk because your Mac is using it to run macOS.

How do I wipe my Mac and reinstall OS?

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.

How do I wipe my Mac and reinstall Catalina?

Restart and InstallUse 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.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.More items…•

How do I do a factory reset?

Open Settings, and select System.Select Reset options.Select Erase all data (factory reset).Select Reset Phone or Reset Tablet at the bottom.You’ll be asked to confirm, select Erase Everything.Your device should reboot and may show a progress screen indicating that it is erasing the data.

How do I wipe my Mac before selling it?

How to Wipe a Mac Hard Disk Drive (HDD)Make sure your Mac is turned off.Press the power button.Immediately hold down the command and R keys.Wait until the Apple logo appears.Select “Disk Utility” from the OS X Utilities list. … Select the disk you’d like to erase by clicking on it in the sidebar.More items…•

How do I restore my Mac from the Internet?

How to use Internet Recovery to reinstall macOSShut down your Mac.Hold down Command-Option/Alt-R and press the Power button. … Hold down those keys until you a spinning globe and the message “Starting Internet Recovery. … The message will be replaced with a progress bar. … Wait for the MacOS Utilities screen to appear.More items…•