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How to install Mac OS X from USB?
How to install Mac OS X from USB?
10-03-2013 - 04:37 PM


  • Posts: 32
  • Joined: Sep 2013
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Follow these below steps will create for you not a bootable USB to install OS X but also a USB to verify/repair disk partitions, repair current installed OSX, upgrade to new OSX.

Step 1: Go to App Store to download Mac OS X installer.
Step 2: Right click (or control-click) on the OS X installer file and select "Show Package Contents".


Step 3: Open the "Contents" folder, navigate to the "SharedSupport" folder. You’ll find a disk image called “InstallESD.dmg.”


Step 4: Go to search icon and type "Disk Utility" then open that application.


Step 5: Drag and drop the “InstallESD.dmg” file from "SharedSupport" folder into the white box on the left side of Disk Utility, and the disk image now will be loaded.


Step 6: Insert your USB drive into the Mac. Select the USB from the list in Disk Utility.
Step 7: Select the Partition tab > click the Format drop-down menu > select “Mac OS Extended (Journaled)”.


Step 8: Click on the Options button and select the radio button for GUID Partition Table and click OK.


Step 9: Select the "Erase" tab


Step 10: Click on "Erase" button then wait for USB disk to be formatted.
Step 11: On the left side of Disk Utility app click on “InstallESD.dmg” icon then click on the Restore tab.
In Source textbox “InstallESD.dmg” is already selected.


Step 12: For Destination path, drag & drop the partition created on the USB drive onto the textbox. .
Step 13: Click Restore button and select Erase from the application, if prompted to do so.


The process may take some time for about one hour so please be patient.
Step 14: After the process completed, close Disk Utility.
You now got a bootable USB disk to be ready to install Mac OS X Mountain Lion.
Step 15: Restart the Mac. While restarting, press Option key.
Step 16: Select the USB from the menu and now you can boot from it to install Mac OS X.


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