Windows. There is no support for this but it was done on Apple. More at http://www.wrightthisway.com/Articles/000154.html
So the answer today for Windows is no.
Ok, I found a really interesting weekend project on YouTube: gutting out an old hard drive and replacing the insides with a USB hub and USB drives plugged into said hub (with the casings on everything removed, so everything fits), and then running a cable through a hole that I create in the side of the casing so I can plug the whole thing into a USB port on my computer.
Anyways, I have the hardware understanding set, but I have one problem: if I were to plug this in, the computer would recognize the drives as separate letters, which ruins the fact that this is supposed to sort of be a hard drive (nothing major, I won't have important data on it... it's just for a proof of concept). I was thinking, how could a person stripe all of the drives in a sort of RAID 0? I want the drives to be recognized as one drive letter on any computer I were to plug this "USB flash hard drive" into. Assume that every computer I were plugging this into is running a Windows operating system.
Any insight would be greatly appreciated.