As far as I know, and as far as Google has helped, this would be pretty complicated, if you don't want to hide the drive.
You could:
1. Encrypt the folder / drive with TurCrypt
2. Make it shared, but add a password - Not too sure about this.
3. This :
http://www.sevenforums.com/tutorials...-software.html
Note: For the third solution, you could move the batch file out of the dir as well.