How to make a bootable USB key from an .iso image on Mac OS X? I do not believe this is truly a duplicate, as it states "any .iso". The flagged "duplicate" is specific to making a bootable USB drive with OSX. In my case I am building a PC with no optical drive, need to get the Windows .ISO onto a flash drive, and I have only Macs available to do it. The answer below appears to be appropriate, but I have not yet tried it...