Requirements:
-A Computer
-Working internet connection
-Modded xbox with an ethernet chord shuved in the back.
Step 1:
Turn your xbox on and wait for your dashboard to come up. Once it is up go to your settings button and look for network settings. Go in there and read what your ip address.
Hint: if you have the noob softmod dashboard that has the x button in the middle then your ip will be on the bottom right of the screen.
My ip is 192.168.0.118
Step 2:
Go to your computer and open up any folder. Ex.) My music, My pictures, etc... Once it is open then in the top directory address you type in the following. Type in the following: FTP://192.168.0.118/. Put your IP though instead of mine.
Step 3: It should take just few seconds and then it will either prompt you for your password whcih you should already know or take you straight to your drives.
Any questions or if you need more help then just message me. Every tutorial i see people always say you need an ftp program and im just saying that you dont and that this is a hell of a lot easier.
Enjoy!

Edit: I'll add some good pics soon when i get the chance.