1. Prep USB drive
   • Plug in your USB
   • Find Disk Identifier; wherever you see X in this guide, replace it with your unique Disk Identifier
   • Open terminal and execute sudo diskutil unmountDisk diskX (remember to substitute X for the unique Disk Identifier - i.e. 1)
   • BE VERY CAREFUL to accurately copy the Disk Identifier. If you get it wrong, the dd command below will quickly and irrevocably overwrite one of your drives, possibly your main boot drive.
2. Prep ChromeOS Image
   • Download the build to your desktop
   • Execute cd Desktop
   • Execute tar -zxvf ChromeOS-Flow.tar.gz
   • You now have an uncompressed image on your desktop
3. Write to USB
   • Execute sudo dd if=ChromeOS-Flow.img of=/dev/rdiskX bs=4m (remember to substitute X for the unique Disk Identifier - i.e. 1)
   • Type your Mac OSX user account password when prompted
   • Sit back and wait ~30-90 minutes (check progress)
   • You'll know it's done when it gives you your shell prompt back
4. Once it's finished you can remove your USB and boot from a normal PC or try to boot from your mac

Check out this YouTube video for a visual walkthrough of the write process ¹⁾:

This video is not visible in Germany! “This video contains content from Sony Music Entertainment. It's no longer available in your country.”

• If you get an error such as “Resource busy”, it's because you forgot unmount the volume
• If you get a “corrupt image” error:
  • Re-download the file to your desktop
  • Extract using above method
  • Execute cd Desktop; md5 ChromeOS-Flow.img
  • Compare this output to the checksum on the main page