vista/win7: partition that was mounted as a folder

[jarthel]

http://www.vistax64.com/tutorials/196423-mount-dismount-drive-partition-folder.html

It is possible to mount a partition/drive into an empty folder.

e.g.
drive c = hdd1
drive d = hdd2
d:\temp = hdd3 (was mounted into the empty folder temp)

What happens if I reinstalled windows? I suppose I would get 3 drive letters instead of 2?

Thank you