MAC: How To Install OS X After Formatting Your Hard Drive - Factory Reset / Fresh Reinstall OSX

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Added 4 years ago by tomm

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In this video I show you how to reinstall MAC OS X on your apple computer. This method should work on all apple computers and with all recent versions of MAC OS. For this guide I used a friends Macbook Pro that they had accidentally formatted the entire hard drive on, erasing all of their information but also the operating system. The Yosemite installer application (Install OS X Yosemite.app) I use was downloaded from the app store.

To follow this procedure you will need a flash drive / USB stick of at least 8GB capacity and another (working) apple mac or computer running MAC OS.
This process can take a long time depending on the speed of your USB drive, I recommend using a USB 3.0 stick in a USB 3 port.

IF YOU GET THE "This copy of the install OS X (VERSION NAME) application can't be verified. It may have been corrupted or tampered with during downloading." ERROR WHEN INSTALLING...
You need to change the date / year on the computer using the command line (terminal) as shows in the video at 9:13 - The most important part of the date is that the year should be set to the same year that your installer was downloaded.
You can view this by right clicking on your "Install OS X VERSION.app" file and choosing "Get Info", then reading the year under "Created" or "Modified".

Names of commonly used MAC OS installers: (from the app store)
Install OS X Mavericks.app
Install OS X Yosemite.app
Install OS X El Capitan.app
Install OS X Sierra.app
Install OS X Mojave.app

Command for the terminal to create your USB stick:
IMPORTANT: Remember to modify it (as shown in the video at 3:16 ) for your version of the Mac OS X installer!
- - - - - - - - - - Yosemite USB Creator.txt - - - - - - - - - -
sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/USB --applicationpath /Applications/Install\ OS\ X\ Yosemite.app --nointeraction
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Tested and working 100%, multiple times by myself using Mac OS X Yosemite & El Capitan on Macbook Pro's.
This should work fine with all other versions of Mac OS X and all other apple Mac computers! Including Macbook Pro, Macbook Air, Mac Pro, iMac, Mac Mini, Apple Laptops, Macbook & iMac with Retina or 4K / 5K Display and more.