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HOW TO MAKE A BOOTABLE USB STICK FROM AN ISO FILE ON AN APPLE MAC OS X

This quick step by step will show you how to make a bootable USB stick from a downloaded ISO image file using an Apple Mac OS X.

Note: this procedure requires an .img file that you will be required to create from the .iso file you download.

Tip: Drag and Drop a file from Finder to Terminal to 'paste' the full path without typing and risking typos.

Download the desired file
Open the Terminal (in /Applications/Utilities/ or query Terminal in Spotlight)
Convert the .iso file to .img using the convert option of hdiutil:

hdiutil convert -format UDRW -o /path/to/target.img /path/to/source.iso

Note: OS X tends to put the .dmg ending on the output file automatically. Rename the file by typing:

mv /path/to/target.img.dmg /path/to/target.img
  • Run diskutil list to get the current list of devices
  • Insert your flash media
  • Run diskutil list again and determine the device node assigned to your flash media (e.g. /dev/disk2)
  • Run diskutil unmountDisk /dev/diskN

replace N with the disk number from the last command - in the previous example, N would be 3

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).

Note: This might take a while... Note: Using /dev/rdisk instead of /dev/disk may be faster.
Note: 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.
Note: 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. p.ex. diskutil unmountDisk /dev/disk3

  • Run diskutil eject /dev/diskN and remove your flash media when the command completes
  • Now the USB stick is ready.
  • Boot the device that you want from the USB stick.

credit to (Lewan Technology)[https://www.lewan.com/blog/2012/02/10/making-a-bootable-usb-stick-on-an-apple-mac-os-x-from-an-iso]