Guide: create a bootable USB Drive of OS X Lion/Mountain Lion installation


Requirements:
  1. A Mac, an OS X virtualized or a Hackintosh working.
  2. A USB Drive of 8GB or larger.
  3. Remember to do a Backup of your data that are in the USB Drive, because for the USB bootable creation you'll have to initialize the USB Drive.


  1. Download InstallESD.dmg of OS X Lion/Mountain Lion
  2. Mount InstallESD.dmg
  3. Enable the hidden files by typing from Terminal:
  4. defaults write com.apple.finder AppleShowAllFiles -bool true
  5. Mount BaseSystem.dmg
  6. Insert the USB Drive and open Disk Utility
  7. Click on the USB Drive, then click on the Partition tab
  8. Click on Options... and then tick Master Boot Record (MBR)
  9. From the drop-down menu, select 1 Partition
  10. Give a name at the partition (eg 'USB'), then, click on Format and select Mac OS Extended (Journaled)
  11. Click on Initialize, and wait the end of the initialization
  12. Click on the Restore tab and drag Mac OS X Base System in Source and USB (the partition created previously) in Destination. At the end, click Restore. The process requires about 5-10 minutes.
  13. At the end of the restore there'll be two volumes named identical, namely: Mac OS X Base System. Is advised to rename the USB Drive with another name to distinguish it between the volumes
  14. Open the InstallESD volume and copy the hidden file mach_kernel in the root of the USB Drive
  15. Always in InstallESD, copy the folder Packages (by pressing ⌥ Option+C)
  16. Head in USB/System/Installation and delete the Packages alias
  17. Now paste the Packages folder (by pressing ⌥ Option+V)
  18. Download the USB_Files.zip archive and instal the 4 kexts contained with Kext Wizard (if you don't know how to use it come si utilizza click on this link for the guide)
  19. Download the 'Chameleon' Bootloader (Latest Trunk) from this topic and install it in the USB Drive

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