Estimated Mod Time: 2 minutes
Mod Difficulty: Easy
Information & Setup
This modification is completely computer-side, meaning that you will have to change no settings on your Zune. This is a good thing and a bad thing. The good news is that there is no worry about voiding your Zune's warranty, but the bad news is that you must complete this mod on every computer you with to use to access your Zune as a portable hard drive.
The only setup required is that your Zune is NOT connected and the Zune Software is NOT running
And remember, ZuneMods.net is not responsible for any possible problems that may occur. Changing your registry is something you should perform at your own risk, because if you change the wrong values your computer may not function properly.
Hit the "Start" button and choose "Run".
Step 2
Now, a window should pop-up and on the top it should read "registry Editor". Now in that window use the left side browser to find "HKEY_LOCAL_MACHINE\System\ControlSet001\Enum\ USB\ ". Once you have completed that your screen should look like the following:
Step 3 
Right click on the folder titled "USB" that you just found and select "Find".
In the "Find" window search for "PortableDeviceNameSpace"
Step 4
The right section of the window should now look like the following:
(Click to See the Full Image)
The next step is changing the following values:
Change: "EnableLegacySupport" from "0" to "1"
Change: "ShowInShell" from "0" to "1"
Change: "PortableDeviceNameSpaceExcludeFromShell" from "1" to "0"
Step 5
Close all windows and connect your Zune. Now when you browse to "My Computer" it should read your Zune as a device that you can browse into, and drag and drop files into.
In order to access files freely on your Zune, you must make sure that the Zune software is RUNNING. If you try to access your Zune as a hard disk while the Zune software is closed, it will give you a permission error.
Conclusion
Now remember, this must be done on every computer you wish to use to access your Zune. I know this article may look long but once you have done it once or twice it really only takes a minute or two to do it.
Immediately I noticed a major convenience, the "Music" folder in the Zune organizes your music by artist. This means that it is VERY easy to transfer music and songs to a friends computer.
This Patch is for People that want to use there zune
as an external HDD but dont want to get there hands
dirty by using the registry
It is written purely in win32 asm
so it doesnt depend on any other files
to run
=======
1. Unplug your zune and shutdown Zune software
2. Run Patcher
2 a. (After you click Run you need to type "regedit" into the box) thanks itami i dont got a zune i got it from a friends site with his tut.
3. Plug your Zune back in
4. Goto MY Computer and You will see your zune =]
sorry for the rapidshare but i havent got a mirror yet
note: this is NOT a copy of the berdon patcher nor is it meant to take the place of.
Its merely my version that doesnt require the .net framework and is prettier lol
Download here
http://rapidshare.com/files/13231684/Zune_HDD_Patcher.rar