You may or may not be aware of it, but there is a 200 megabyte partition on the root of your drive. It's the OS X EFI partition, part of OS X's default GUID partition method, which normally holds information specific to Apple hardware. For Hackintosh users, however, it has no use whatsoever. It can therefore be re-purposed to hold the bootloader, and any extra files such as DSDT, /Extra folder, org.chameleon.boot.plist, and smbios.plist. If you're one of those users who like an extremely 'vanilla' installation of OS X, you may want to rid your drive of all extra Hackintosh-related files. The following method will lead you through installing all of these files to your EFI partition. This method solves 2 current issues: Legacy boot with AMD Radeon HD 7xxx and and Rx-200 graphics cards. Allows full usage of Chimera/Chameleon to boot without use of integrated graphics. For details on the issue, see here. Legacy boot with GPT disks on ASUS 8-series motherboards. Allows full usage of Chimera/Chameleon to boot GPT (GUID Partition Table) disks. No need to format MBR. NOTE: This procedure is entirely optional, and will not give you any other benefits beyond cleaning the root of your install. Also, each time you want to make changes, you'll have to mount your EFI partition through the Terminal. If you're uncomfortable using the Terminal, do not proceed. STEP 1: BEFORE YOU BEGIN For the purposes of this guide, I recommend unplugging all drives except your main hard drive and rebooting. This will minimize any problems with disk number and partition number. I will use disk0 by default in this guide. To make sure your disk is identified as disk0: Open /Utilities/Terminal Type diskutil list If your drive's root is disk0, you're ready to begin. STEP 2: REFORMAT AND MOUNT YOUR EFI PARTITION Type: sudo -s Enter your password Type: newfs_hfs -v EFI /dev/disk0s1 Type: mkdir /Volumes/EFI Type: mount_hfs /dev/disk0s1 /Volumes/EFI Close Terminal STEP 3: INSTALL CHIMERA TO EFI PARTITION Because Chimera will not be on the drive partition anymore, you must re-install it to the EFI partition. We can use he same Chimera binary files that are installed via UniBeast on the USB drive. Plug in your UniBeast USB Drive (Named USB for this example) Open Applications/Utilities/Terminal Type: diskutil list and locate your EFI partition. It will be under IDENTIFIER. Be sure to use the correct one. (For this example: disk0s1) Type: cd /Volumes/USB/usr/standalone/i386 Type: sudo -s Type: fdisk -f boot0 -u -y /dev/rdisk0 Type: dd if=boot1h of=/dev/rdisk0s1 Type: cp boot /Volumes/EFI/ Close Terminal STEP 4: COPY FILES TO EFI PARTITION Drag your current /Extra file to your EFI Partition. Alternately, install basic boot options, system definition, and theme from MultiBeast. If this is a fresh installation, you'll also need to install FakeSMC to your main hard drive. STEP 5: SET THE EFI PARTITION AS ACTIVE You now have to set the EFI partition so that your computer boots from it first. Then delete the duplicate extra files from your system drive. Open Applications/Utilities/Terminal Type: sudo -s Enter your password. Type: fdisk -e /dev/rdisk0 Type: p Type: f 1 Type: w Type: y Type: quit Type: rm -R /boot /Extra Reboot HOW TO MOUNT/UNMOUNT EFI PARTITION The EFI partition will not automatically mount as other partitions do at boot time. If you ever need to change/update files in the EFI partition: Type mkdir /Volumes/EFI Type sudo mount_hfs /dev/disk0s1 /Volumes/EFI The EFI Partition will then mount on the desktop and in Finder. If you'd rather stay out of the Terminal, you can use EFI Mounter. It's a nice little app/script you can stick in your Applications folder to mount and unmount with a click. Credit to Chameleon EFI install scripts/Munky's EFI install guides. Revised and reprinted from tonymacx86 Legacy Blog.