Create A Bootable OS X Yosemite USB Installer

DECEMBER 29, 2014

OS X Yosemite is finally here. And if you’re doing a clean install for your upgrade, you’ll need to create a bootable Yosemite USB installer. Below are the simple steps to create one.



  • The “Install OS X” launcher. You can find it in the Applications folder right after you downloaded it from the Mac App Store.
  • A USB Flash Drive that has at least 8 GB of storage.


Formatting the USB Installer Drive

1. Insert the USB Flash Drive to the Mac and open the Disk Utility, then select the USB Flash Drive from the left side list


  1. Click on the “Erase” tab and select Mac OS Extended (Journaled) on the Format options then click the “Erase” button and confirm.


  1. Next go to “Partition” tab and under the “Partition Layout” select “1 Partition” on the pulldown menu (from Current)


  1. Under it change the name “UNTITLED1” to “UNTITLED”


  1. Click the “Options” button and select “GUID Partition Table” as the partition scheme and click “OK”.


  1. Click “Apply” and confirm. Then quit Disk Utility.


Creating the Bootable OS X Yosemite USB Installer

  1. After downloading the OS X Yosemite from the Mac App Store, the app launches automatically. Ignore and quit the window.

  1. Open the Terminal app and enter the following command exactly. Copy and paste works also.


sudo /Applications/Install OS X --volume /Volumes/Untitled --applicationpath /Applications/Install OS X --nointeraction


  1. Enter the administrator password when prompted (you may notice that the cursor is not moving, ignore it and just type your password) and hit Enter to start creating the installer.


  1. This may take a while so just let it finish until you see the “Done.” message at the last line. When finished, quit the Terminal app.


  1. Open the Mac Finder and you should see the newly created “Install OS X Yosemite” installer drive.


  1. Restart your Mac and hold the Option key to boot the USB Installer you just created. The following window will appear and select the “Install OS X Yosemite” drive and click “Install”.


  1. Configure according to your preferred settings and  you’re done.

Enjoy the new OS X Yosemite for Mac!