How to completely restore OSX Lion

Discussion in 'Mac OS X Lion (10.7)' started by Kauai, Apr 20, 2012.

  1. Kauai macrumors 6502a

    Oct 13, 2010

    First of all, yes, I did do some google research. And followed all the instructions. But whenever I try to find out how to restore Lion all that comes up is information on how to recover it.

    I went through the whole CMD + R thing where I reinstalled it; but I want to wipe the computer completely clean with a fresh copy of Lion (which I downloaded from the App store) sans all files; like a new computer. Is this possible?
  2. phyrexia macrumors 6502a

    Sep 3, 2010
    When you CMD+R you need to enter Disk Utility and reformat your hard drive. This will ensure a clean install occurs. It will also delete everything on your hard disc, so you should attempt to back up your data before formatting.
  3. Kauai thread starter macrumors 6502a

    Oct 13, 2010
    If I reformat the whole drive will that wreck up the install; though, since the installer is on my computer? (I know it's internet-based too, but the actual installer is on my computer no?)
  4. tyrell456 macrumors member

    Dec 28, 2011
    Salt Lake City, Utah
    Whenever you install Lion on a Mac (or it comes pre-installed), it creates a separate, small partition with the Recovery files on it. When you use CMD+R to boot into the Recovery mode, it boots into this partition. You can fully wipe and format the partition that the OS is installed on from here, and then re-install a fresh copy of Lion.
  5. phyrexia macrumors 6502a

    Sep 3, 2010
    My early-2011 MBP 17" will boot to Recovery mode with no hard drive installed. The recovery partition is not located on the hard disc. After I installed my SSD I was able to boot straight into Recovery mode. This was with a blank, freshly opened, unformatted SSD.

    Several months ago there was a firmware update for 2011 macs which apparently installs Recovery into firmware.

    I don't think this is the case on macs built before 2011. I am not sure of the specifics; this is how it works on my MBP.
  6. Bear macrumors G3

    Jul 23, 2002
    Sol III - Terra
    There are several models of Macs from 2010 and 2011 which have firmware updates - see Computers that can be upgraded to use Lion Internet Recovery.

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