I wanted to password protect other partitions on my HDD so, I used the following code :
gksu gedit /var/lib/polkit-1/localauthority/10-vendor.d/com.ubuntu.desktop.pkla
and made these changes in that file :
#[Mounting, checking, etc. of internal drives]
But i am just once asked for password and then i can keep mounting all the partitions. I can add again after i unmount, close and reopen the file manager.
I wish that the system asks for password, EVERY TIME i try to access any partition on my HDD or external drive / partition after i unmount it.
How can we do that ?