"Save me, oh God, from people who have no sense of humor."
— Ludlow Porch

Make a bootable USB drive for ANY bootable ISO from Linux.

So, you have abandoned Microsoft Windows wholesale, choosing to perform most of your work in Linux or OSX. But now you need to make a bootable Windows 10 USB drive in order to set up a laptop for someone. You Google how to create a bootable disk "FROM LINUX" but all you get is different flavors of the same Ubuntu bootable live USB drive from Windows. Occasionally you'll find a tutorial for Linux that references some crappy UI app to do it for you.

That's not necessary.  It's pretty easy to make a bootable flash drive from Linux using ANY bootable ISO you have access to. Here's the command...

sudo dd bs=4M if=blahblahblah.iso of=/dev/sda && sync

Break it down...

  • sudo -> because you have to be a super-user in order to do it.
  • dd -> data dump (dd) is the program we will use.
  • bs=4M -> Be sure to use four-meter long bullshit sticks *
  • if -> input file
  • of -> output file. In this case the flash drive is /dev/sda.
  • && -> chain another command IF the first command succeeds.
  • sync -> flushes the write buffers to ensure that the write operation is complete before you yank the drive.

* just kidding. bs is the BlockSize switch. We're telling dd to copy the data in 4Megabyte blocks. If you're on a Mac, be sure to use a lower-case "m".

If your flash drive partition is  "/dev/sda1" then be sure to use just "/dev/sda". You want to write the iso file contents to the raw drive and not as a separate partition. 

Now you'll NEVER need Windows and Rufus ever again.