I developed an "USB Storage Enabler" Tool for Windows phone 7, so you can easy enable or disable the WP7 USB functionality.
You need to have Zune installed and one device connected for least one time.
To enter the USB Storage you'll close Zune.
Now you can use your phone like a simple USB Stick
This tool requires .NET 2.0.
Yeah, it looks like an another known and great tool
Here is the download link for you:
WP7 USB Storage Enabler
German post on the original page
I've tested this software on NT 6.x (Vista + 7). Please use this software at your own risk.
You only see emtpy folders? Try this:
1. Start Zune and connect your device
2. Click on "Enable" in the USB Storage Enabler Tool
3. Close Zune (or your folders are empty)
If your problem still exists, try this ( Thank you fonck03 ):
1 connected phone to PC
2 restared phone still connected to pc(just off and on)
3 synced with zune
4 enable usb unlocker tool
@ this point I had my phone listed on "computer" with the storage folder, but no sub folders inside (music, photos, all that)
5 closed zune (still no sub folders)
6 diconnected phone and reconnected, worked!!