I'm on a 2011 MacBook Pro trying to install Windows 8.1 from a USB. I tried creating bootable FAT32 and NTFS USBs from my Windows ISO with [Rufus](http://rufus.akeo.ie/), but still I don't see anything in Startup Disk in Windows or OS X:

![enter image description here](https://i.stack.imgur.com/gRktw.png)

**Update 1:**

Attempted to [write ISO to USB with Disk Utility in OS X](https://superuser.com/questions/247682/how-can-i-install-a-windows-7-into-bootcamp-via-usb), but it wouldn't let me select the ISO (see JeremyKun's comment).

**Update 2:**

Managed to [write the ISO to USB with dd in OS X](https://apple.stackexchange.com/questions/73183/copying-iso-file-to-usb-drive-in-os-x), but still I don't see it in Startup Disk.