Can you do a "clean install" of Yosemite without installing via USB drive?

Discussion in 'OS X Yosemite (10.10)' started by Mr. RPG, Oct 17, 2014.

  1. Mr. RPG macrumors 6502a

    Joined:
    Sep 21, 2012
    #1
    I just want this to be clear.. After downloading Yosemite from the Mac App Store, can you do a clean install without using a a USB boot drive? I only own one Mac so I don't have any need for a USB boot drive.
     
  2. deviant macrumors 65816

    Joined:
    Oct 27, 2007
    #2
    i kinda doubt it because the installer is located on your internal hdd so you can't format it. just buy a usb stick, it's like 3 bucks
     
  3. Mr. RPG thread starter macrumors 6502a

    Joined:
    Sep 21, 2012
    #3
    I have one, I was just asking because some sites are really unclear on this and keep acting like you can do a "clean install" without a USB drive...

    Thanks.
     
  4. -BigMac- Suspended

    -BigMac-

    Joined:
    Apr 15, 2011
    Location:
    Melbourne, Australia
    #4
    yes you can do a clean install without using a usb thumb drive. its called dvd :D
     
  5. crjackson2134 macrumors 68020

    crjackson2134

    Joined:
    Mar 6, 2013
    Location:
    Charlotte, NC
    #5
    Sure you can, boot from a different drive, run the installer from there. During the install process the installer asks you if you want to pick a different drive. The default is the drive you are booted from, but the drive picker lets you install it elsewhere.
     
  6. deviant macrumors 65816

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    Oct 27, 2007
    #6
    you sad you didn't have one because you only had 1 mac or something.
     
  7. tywebb13 macrumors 68020

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    Apr 21, 2012
    #7
  8. SoloStyle macrumors regular

    Joined:
    Oct 17, 2011
    #8
    Yes you can, this is exactly what I did. First I upgraded to Yosemite, then backed up any files I needed to save. Then restart, holding CMD+R to boot into recovery. Select Disk Utility, choose Macintosh HD, then select Format as Mac OS X Extended (Journaled). Click Erase.

    When it’s finished, close out Disk Utility and select “Reinstall OS X” from the menu. It will ask for your iTunes password to redownload OS X Yosemite and start installing.

    You must be connected to the internet for this to work.
     
  9. deviant macrumors 65816

    Joined:
    Oct 27, 2007
    #9
    that's worse than watching flies f4ck though. install-format-install? :)
     
  10. cosminsel macrumors member

    cosminsel

    Joined:
    Oct 8, 2014
    Location:
    Ontario, Canada
    #10
    I did this too. Took a while because the Yosemite installer had to downloaded again but it worked.
     
  11. 3lite macrumors 6502a

    3lite

    Joined:
    Nov 7, 2011
    #11
    Going to do this right now.
     
  12. Jedi macrumors regular

    Jedi

    Joined:
    Apr 28, 2008
    #12
    You CAN NOT nuke`n-pave a startup sys. folder.

    Simple :D

    That is why you need a way to boot externally :eek:

    Later ,

    Gary *
     
  13. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #13
    You can do it from the recovery partition like SoloStyle described. No external boot is needed if you don't mind the double DL of the OS.
     
  14. m4v3r1ck macrumors 68020

    m4v3r1ck

    Joined:
    Nov 2, 2011
    Location:
    The Netherlands
    #14

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