Is it possible to cleaninstall and reinstall OS X with a USB boot ?

Discussion in 'MacBook' started by Pandarama, Jun 4, 2015.

  1. Pandarama macrumors member

    Pandarama

    Joined:
    Jun 1, 2015
    Location:
    France
    #1
    Hello,

    I use to cleaninstall and reinstall OS X with a USB key, and boot on USB. It is possible with an adapter and a classic USB key ?

    Thanks a lot
     
  2. headcase macrumors 6502

    headcase

    Joined:
    Jul 4, 2007
    Location:
    Raleigh, NC
    #2
    Sure. I've done it a few times already on some retina MacBooks. This app makes it really simple to set up:
    http://diskmakerx.com
     
  3. Pandarama thread starter macrumors member

    Pandarama

    Joined:
    Jun 1, 2015
    Location:
    France
    #3
    Thank you very much, was not sure about the adapter ^^ , how long did it take ?
     
  4. tutux macrumors member

    tutux

    Joined:
    May 4, 2015
    #4
    What would be the advantage compared to an install via the system recovery (and do a clean install from there)?
     
  5. Pandarama thread starter macrumors member

    Pandarama

    Joined:
    Jun 1, 2015
    Location:
    France
    #5
    I'm not sure but I think :
    First you win some time, because you have already DL the OS (from Mac App Store, but you can work/chill during), you only have to install it.

    Then it's more proper than a wifi install.

    I prefer boot on USB than recovery system, I have an USB key dedicated to do that.
     
  6. tutux macrumors member

    tutux

    Joined:
    May 4, 2015
    #6

    The only technical valid point here is that you don't have to DL the entire OS (I tend to forgot this point because I have fast internet access).

    Then, if you prefer to do it this way, it's like I prefer to drink my coffee without sugar, matter of taste, and will not argue this :)
     
  7. Pandarama thread starter macrumors member

    Pandarama

    Joined:
    Jun 1, 2015
    Location:
    France
    #7
    Exactly, I prefer, but if u have stable and fast access it's the same :) (but there is a rumor that says from USB is more proper than wifi)

    The question is : How long does it take from USB boot ?
     
  8. tutux macrumors member

    tutux

    Joined:
    May 4, 2015
    #8
    Curious to read details as download from internet basically download the dmg+ scripts to do exactly the same as usb key but from recovery partition...

    Urban legend I guess?
     
  9. Pandarama thread starter macrumors member

    Pandarama

    Joined:
    Jun 1, 2015
    Location:
    France
    #9
    Yes urban legend for sure ;)
     
  10. darngooddesign macrumors G3

    Joined:
    Jul 4, 2007
    Location:
    Atlanta, GA
    #10
    I don't have an answer to your question, but I would like to point out that installing from the recovery partition is not the same as internet recovery. The OS installer is on your harddrive already so it would actually be faster than booting from external USB.
     
  11. bcaslis, Jun 4, 2015
    Last edited: Jun 4, 2015

    bcaslis macrumors 68020

    Joined:
    Mar 11, 2008
    #11
    Yes, I've done it.

    Download the Yosemite installer. If done now, it will be 10.10.3 which is the minimum version you need. Let it download but quit the installer when it starts to run. Use a formatted USB stick at least 8GB minimum. Then run these commands in the terminal window:

    sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ Yosemite.app --nointeraction

    Note this assumes the USB stick is named Untitled. This will take about 20 minutes. When complete restart and hold the option key. Select the USB stick as the startup. Then after the you boot to the installation window, select Disk Utility from the menubar at the top. You can then then format or erase the SSD. Then quit Disk Utility and run the installer on your cleaned out SSD.

    I do this for almost all new Macs and I get and I did this for the rMB.
     

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