(Or whatever you want to call it... Some people call them USB Keychains.)
Quick Note: UFD stands for "USB Flash Drive".
On to the tutorial ! First step would be to actually download Qemu. If you Google it you'll see this address at the very top. Click the Download link. You'll see somewhere "QEMU on Windows provides precompiled QEMU versions for Windows." which will most likely send you to: http://www.h7.dion.ne.jp/~qemu-win/
Here's a mirror to the latest version (available right now) for Windows:
qemu-0.9.1-windows.zip [12.5 MB]
It was labeled as QEMU on Windows Ver 0.9.1 (2/4/2008)
1. Extract the archive to C: (for example) and rename the folder as "qemu" or "qEmu", "QeMu", "qemU" or whatever. "Qemu" would be best.
2. You can either create a batch file by right clicking inside the "Qemu" folder, choosing New -> Text Document and changing it's extension by renaming it to "usb.bat" or "test.bat" (or whatever) and adding these two lines:
@echo off qemu.exe -L "C:\qemu" -M pc -localtime -boot c -hda \\\\.\\physicaldrive1
For simplicity purposes I've also uploaded the batch file.
Question: What if it doesn't work and my UFD isn't recognized as "physicaldrive1" ?
Answer: That's how my PC recognizes mine. Yours may differ. You ccould get this (or a similar tool) and verify.
PS: I believe the Linux version of this tutorial isn't very difficult either. If someone could please post the batch and/or method I would very much appreciate it. Thanks.