Problem Installing ESXi 5.1 From CD - Installing From USB Instead

I was having problem getting my hosts to read a CD that I had written the ESXi 5.1 ISO to - it would not install from the directly attached CD drive, or an externally connected USB CD drive. In the end I used an app called UNetbootin to create a bootable USB drive with the ESXi ISO.

This can be downloaded from http://unetbootin.sourceforge.net/