Create USB boot disk from ISO in MacOSX with dd

1. Download the desired .iso/.img file.
2. Open a Terminal (under Utilities).
3. Run

   diskutil list

   to get the current list of devices.

4. Insert your flash media.
5. Run

   diskutil list

   again and determine the device node assigned to your flash media (e.g. /dev/disk2).

6. Run

   diskutil unmountDisk /dev/diskN

   where N is the number of your usb drive.

7. Execute

   sudo dd if=/path/to/downloaded.img of=/dev/diskN bs=1024

8. Wait for the command to finish (it is now ”burning” the ISO onto the USB drive).
9. Run

   diskutil eject /dev/diskN

   and remove your flash media when the command completes