How to Create bootable USB of Yosemite ( OS X 10.10 )

Okay, Lets See how to create bootable USB of Yosemite ( OS X 10.10 ) .


  1. Working MacOS Operating System
  2. OSX Yosemite DP1 Application ( Require Developers account to download )
  3. 8+ GB of USB drive ( 16GB is good )
  4. Time

Okay Now Steps

  1. Right click on “Install OS X 10.10 Developer Preview” and click show package contents
  2. Go inside “Contents/Shared Support ” Folder
  3. Click on “InstallESD.dmg” it will mount that
  4. open terminal and type
defaults write AppleShowAllFiles TRUE
killall Finder

Now open finder and open “OS X Install ESD” image ,
5 . Right click and open “OS X BaseSystem.dmg” image

Lets , Prepare USB

Insert USB drive and open Disk Utility
Now Partition USB with
Partition map : Master Boot Record
Format : Mac OS Extended (Journaled)

Screen Shot 2014-06-19 at 10.33.10 am

Now lets restore “OS X Base System ” To USB

Source : OS X Base System
Destination : USB

Screen Shot 2014-06-19 at 10.51.31 am

Now you will have “TWO” OS X Install ESD Open USB ( Hint : Click On Mount Point Of USB in Disk Utility )
and Rename That to “USB”

  • open That USB and Go to “System/Installation/”
  • and delete “packages” symlink

Copy “Packages ” Folder From “OS X Install ESD ” and paste that into “/USB/System/Installation/” Folder

Now Go to “OS X Install ESD ” and Copy “BaseSystem.chunklist ” and “BaseSystem.dmg” files both are hidden
Paste that into Root OF “USB” ( paste this commands to do that )

cp -rv /Volumes/OS\ X\ Install\ ESD/BaseSystem.* /Volumes/USB/

Install Bootloader

Download Chameleon Bootloader :

Open that Chameleon Installer and Change Installation Location Drive TO ” USB “

After Installation Open “/USB/Extra/org.chameleon.Boot.plist” and Adjust setting according your Motherboard Requirements . and in kernel flags add

“kext-dev-mode=1” without quotes

Now Reboot and choose USB as your first drive . and install Yosemite .


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