2014-05-21

How to create a bootable USB stick on OS X

Note: this procedure requires that you create an .img file from the .iso file you download.
Tip: Drag and drop a file from Finder to Terminal to 'paste' the full path without risking typing errors.
  1. Download the ISO you need.
  2. Open the Terminal
  3. Convert the .iso file to .img using the convert option of hdiutil 
    "hdiutil convert -format UDRW -o ~/path/to/target.img ~/path/to/<*.iso>)
    Note: OS X tends to put the .dmg ending on the output file automatically.
  4. Run "diskutil list" to get the current list of devices.
  5. Insert your flash media.
  6. Run "diskutil list" again and determine the device node assigned to your flash media (e.g. /dev/disk2).
  7. Run diskutil unmount Disk /dev/diskN (replace N with the disk number from the last command; in the previous example, N would be 2).
  8. Execute sudo dd if=/path/to/downloaded.img of=/dev/rdiskN bs=1m (replace /path/to/downloaded.img with the path where the image file is located; for example, ./ubuntu.img or ./ubuntu.dmg).
    • Using /dev/rdisk instead of /dev/disk may be faster
    • If you see the error dd: Invalid number '1m', you are using GNU dd. Use the same command but replace bs=1m with bs=1M
    • If you see the error dd: /dev/diskN: Resource busy, make sure the disk is not in use. Start the 'Disk Utility.app' and unmount (don't eject) the drive
  9. Run diskutil eject /dev/diskN and remove your flash media when the command completes.
  10. Restart your Mac and press alt/option key while the Mac is restarting to choose the USB stick.