There is is big difference in hiding files+folders "as usual" and hiding partitions like you suggested in (video) tutorial:
Hidden files can still be access by outside programs if they know the absolute path to them. They ar still alive.
If I hide a partition in partition table then it is completely invisible to WHOLE WinOS.
I want to hide partitions but still be able to access them.
So the question is still unanswered: Can I hide partitions?