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The initial erase and data removal process is how this primarily differs from simply reinstalling Mac OS X system software on the Mac without formatting the Mac to begin with, which would maintain files and apps and user data, whereas the factory reset completely removes everything and starts fresh. Note the difference between a reset of the Mac and a simple reinstall of system software: a true factory reset of a Mac as we’ll show here, is that the computer is erased clean of any and all data entirely, and then a new factory installation of Mac OS X system software is installed on the computer. You can also perform the exact same actions as described here from a boot USB disk if you have one.

This reset and restore method is the same with every Mac computer out there, including iMac, MacBook Pro, MacBook, MacBook Air, Mac Mini, and Mac Pro, as long as the Mac is running a somewhat modern version of Mac OS system software with recovery mode support.