You can access recovery without a partition using Network Recovery: hold Command+Shift+R while turning on your Mac and it will download the Recovery features for you. Failing that, you can create a bootable USB installer for macOS Sierra, and boot from that by holding “Option” while turning on your Mac.
How do I restore my Mac without reinstalling OS?
How to use the Erase All Content and Settings feature to reset a Mac
- Open Apple menu > System Preferences.
- Select System Preferences from the Apple menu bar.
- Choose Erase All Content and Settings.
- Type your admin password and click OK and Continue.
- Read the warnings and select Erase All Content & Settings.
How do I reimage my Mac?
Restart your Mac. While the startup disc is waking up, hold down the Command+R keys simultaneously. You’re Mac will boot into macOS Recover. Click on Reinstall macOS (or Reinstall OS X where applicable) to reinstall the operating system that came with your Mac.
How do I restore my Mac to original version?
How to revert to an old macOS using Time Machine
- Start up your Mac and immediately hold down Command + R.
- Continue holding both keys until you see the Apple logo or a spinning globe.
- When you see the Utilities window choose Restore from Time Machine Backup and click on Continue.
- Click Continue again.
How do I wipe my computer but not operating system?
Press Windows Key + I, type recovery in the search bar, and select Reset this PC. Next, select Remove everything, then Remove files and clean the drive. The Windows 10 reset function can take a while to complete, but it will make sure there is no chance for anyone to recover data from your drive.
How do I wipe my computer but keep OS?
With the help of the recovery tool in Windows 10, you can reset your PC and wipe the drive at the same time. Go to Settings > Update & Security > Recovery, and click Get Started under Reset this PC. You are then asked if you want to keep your files or delete everything.
How do I wipe my Mac hard drive and reinstall OS?
If you’re reinstalling on a Mac notebook computer, plug in the power adapter.
- Start up your computer in macOS Recovery: …
- In the Recovery app window, select Disk Utility, then click Continue.
- In Disk Utility, select the volume you want to erase in the sidebar, then click Erase in the toolbar.
How do I reinstall my Mac startup disk?
Restart your Mac, and press Command + R, while it’s restarting. Select Disk Utility from the macOS Utilities menu. Once Disk Utility has loaded, choose the disk you wish to repair – the default name for your system partition is generally “Macintosh HD”, and choose ‘Repair Disk’.
Is my Mac too old to update?
Apple said that would run happily on a late 2009 or later MacBook or iMac, or a 2010 or later MacBook Air, MacBook Pro, Mac mini or Mac Pro. … This means that if your Mac is older than 2012 it won’t officially be able to run Catalina or Mojave.
Will I lose data if I reinstall macOS?
2 Answers. Reinstalling macOS from the recovery menu does not erase your data. However, if there is a corruption issue, your data may be corrupted as well, its really hard to tell. … Reinatalling the os alone does not erase data.
Does downgrading macOS delete everything?
No matter which way you downgrade your macOS version, you’ll erase everything on your hard drive. To ensure you don’t end up missing anything, your best bet is to back up your entire hard drive. You can back up with the built-in Time Machine, although you must be careful if you use this option.