Complete OS Reinstall

Discussion in 'Mac Basics and Help' started by Habsman, Dec 27, 2009.

  1. Habsman macrumors newbie

    Joined:
    Dec 7, 2009
    #1
    Ok, as i am going from cracked software to legit, i want to completely reinstall my OS (Snow leopard) to make sure any registration files for programs and absolutely everything is gone.

    Now ive never done this before on a Mac so im just asking id there anything i need to do to ensure that everything is lost in the reinstall?

    Basically, i want it to be like a brand new Computer again with nothing left behind.

    Also, will i need any license keys for the OS?

    Happy Christmas!!:)
     
  2. VPrime macrumors 68000

    VPrime

    Joined:
    Dec 19, 2008
    Location:
    London Ontario
    #2
    pop in install disk, format the partition using disk utility.
    Install Os.
     
  3. spinnerlys Guest

    spinnerlys

    Joined:
    Sep 7, 2008
    Location:
    forlod bygningen
    #3
    There is an option during installation called Erase and Install, which does what it says.
    [​IMG]

    But know, that this erase procedure does not physically overwrite the HDD, just deletes the pointer, so it seems empty, and will be overwritten by all new data once you put it on that HDD.
     
  4. Habsman thread starter macrumors newbie

    Joined:
    Dec 7, 2009
    #4
    Thanks, would I format as Mac OS Extended (Journaled)?
     
  5. marcin0903 macrumors regular

    Joined:
    May 9, 2009
    #5
    When I was reinstalling my Snow Leopard I didn't notice any Erase & Intall option. I just inserted my disc with Snow Leopard and restarted my Mac holding "c". It launched Mac from disc and there on the upper bar I launched Disk Utility and just formated everything, as Mac OS Extended Jurnaled - everything gone, so I installed on clean, formated partiotion my Snow Leopard :).

    Sorry for my English. I'm still learning :).
     
  6. Gregg2 macrumors 603

    Joined:
    May 22, 2008
    Location:
    Milwaukee, WI
    #6
    I would.

    Your English is excellent! Your spell check feature let you down a couple of times, but that's not a big deal. ;)
     
  7. DewGuy1999 macrumors 68040

    DewGuy1999

    Joined:
    Jan 25, 2009
    #7
    No license keys required for OS X. Here's a good tutorial on doing a clean install of Snow Leopard:

    Perform a Snow Leopard Clean Install
     
  8. breakfast macrumors member

    Joined:
    Sep 17, 2009
    #8
    I want to perform a clean and install on my brand new MBA (2,1 rev. C), but
    this option simply doesn't appear when I use the SL installation DVD. (This screen isn't even available under Disk Utility).

    After the the language options, only "Install" is available. How do you get this window to come up using the installation DVD?

    :confused:
     
  9. UngratefulNinja macrumors 68000

    UngratefulNinja

    Joined:
    May 9, 2009
    Location:
    Pennsylvania
  10. spinnerlys Guest

    spinnerlys

    Joined:
    Sep 7, 2008
    Location:
    forlod bygningen
    #10
    You have to boot from the SL DVD (not just insert it while running Mac OS X and then running the installer, as that will just Upgrade the system), and at one point, after the language selection, you get the opportunity to select Options/Customize as a button on the bottom left of that installer window.
     
  11. breakfast macrumors member

    Joined:
    Sep 17, 2009
    #11
    Thanks, Spinnerlys, but I think that's what I'm doing. I'm using a remote drive, and powering up with the drive connected (not inserting the disc when running).

    Any ideas?
     
  12. spinnerlys Guest

    spinnerlys

    Joined:
    Sep 7, 2008
    Location:
    forlod bygningen
    #12
    Try the steps pointed out here (except for the archive and install option, but it should get you too that selection screen):
    http://support.apple.com/kb/HT1710
     
  13. Hmac macrumors 68020

    Joined:
    May 30, 2007
    Location:
    Midwest USA
    #13
    You can boot from the SL disc, open Disk Utility and format your hard drive, then install Snow Leopard.
     
  14. DewGuy1999 macrumors 68040

    DewGuy1999

    Joined:
    Jan 25, 2009
    #14
    Those options existed in OS X versions prior to Snow Leopard. Apple simplified the main install screen to make it easier, but, you can still do an Erase and Install. This tutorial tells you how:

    TUTORIAL: Preform a Snow Leopard Clean Install
     
  15. breakfast macrumors member

    Joined:
    Sep 17, 2009
    #15
    Related Issue

    Thanks, all, for the tips. Trying it now using the Disk Utility approach.

    I clicked the right erase option, which erases the whole HD as opposed to just erasing the free space.

    After the erasing is complete, the HD capacity states that 220MB are used. I thought that after erasing everything is gone, so the question I have is what is taking up that space?
     
  16. DewGuy1999 macrumors 68040

    DewGuy1999

    Joined:
    Jan 25, 2009
    #16
    Formatting takes up space. I believe that's what is using the space.
     
  17. Dan73 macrumors 6502a

    Joined:
    Jul 30, 2009
    #17
    Any drive that is formatted to be useable format (FAT, NTFS, HSF, ect) will have space taken up. You can format it as free space where absolutely nothing will be on the drive but the... it won't be useable ;)
     

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