Erase and restore mac os x

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Before you start, make sure you transfer any files you want to keep to a new computer or external drive. Your Mac will boot into the recovery partition. You can access recovery without a partition using Network Recovery: If you want to re-install your operating system, but leave your files in place, you can skip this step.

Part 1: Back Up Your Mac to an External Storage Device

Your user accounts and files will stay exactly where they are—only your operating system will be overwritten. Depending on how you started Recovery Mode, you may be presented with the option to start Disk Utility right away, as seen above. If not you can find Disk Utility in the menu bar: If your Mac has a solid state drive, you can skip this part: Now move the dial up, to randomly write data over your entire drive.

Back up, erase, and reinstall can return your Mac to like new

If you opted to wipe your drive securely, this might take a while—30 minutes to an hour is not unreasonable for one pass. Back up your Mac. Use either iCloud or an external hard drive to store any files you want to keep.

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How to restore your Mac to factory settings

Don't just delete your texts or photos; sign out of iCloud instead. Sign out of iMessage so that you don't miss any texts. Finally, delete everything off your Mac and then reinstall the OS X system. To do this, restart your computer. As it boots up, hold the Command key and R key.

How To Erase and Reset a Mac back to factory default

When you see your hard drive, select it, and then go to the "Erase" tab. Now, reinstall the OS X system.

8 Steps to Reset Your Mac to Factory Settings [Tutorial]

This should be an option after you erase your hard drive and exit Disk Utility. The window will show several options, but select the "Reinstall macOS" one. However, if you have an older Mac, you will need to reinstall the OS X system with the original CD that the computer came with. Turn off your laptop once the OS system is done installing. To do so, hold both the Command and Q keys and then choose "Shut Down.

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