How do I get a partition to automatically mount for one user but not another?

[MajorJohnson]

For security reasons, I would like to have a partition that is mounted/visible from one user profile but not from others even if both profiles are loaded at once. If there is no way to do this with an entire partition, can it be done with a folder. My intention here is not just that one user not be able to read another's files, but that one user won't even see that the other's files even exit. I know that this can be done using each user's "my documents" folder inside each user's profile, but that is on the C drive and that will not work for me because there is not enough room on the C drive to hold the required data.