I want to install Ubuntu on my SSD (128GB) with the /home also on the SSD. On the HDD I will have another partition that will be used as a data storage for movies and other large files.
How can I set it up that upon start up, Ubuntu doesn't even mount the HDD data partition, but will do so only after I open the folder "External Videos" on the HDD?
Does that makes sense. What about encryption on the HDD and should I use ext4?

Thanks for your advice.