Prevent access to a drive

Hello,
         How to prevent access to a drive contents?
         Since, usage of dos commands like dir lists the contents of the drive.
         I want to prevent everybody accessing the particular drive through dos  commands.
        Though i made changes in registry like NoViewOnDrive, NoDrive, dir command breaks the security provided by them.

        Actually, I have an application that creates a drive and it can be mounted as well as unmounted. Till the time the drive is mounted, it is accessible through command prompt commands which I want to stop so as to provide security to that drive.
Please, suggest me a way to come around this problem.

You should stick to the original post.

http://www.computerhope.com/forum/index.php/topic,95261.msg644774.html#msg644774

Since this is a double post it needs to be locked and I have added a question to your other post.