I did just that actually, create a mountable partition! I'm out of space though. Also I'm totally gonna use the term 'romantic action movies' from now on, thanks.If you truly want to password protect you extremely important information. You could buy an external drive (or create a partition), and set password in Disk Utility.
Considering the size of those romantic action movies, you should consider getting an external drive anyway.
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Good idea, another thing I did was create a password protected partition that I can mount. The only downside is that it's a fixed size and It's almost full.Try creating separate accounts. I do with with keeping work separate from home. Keeps me from sending work email with my personal account by accident for example. Keeps files separate but I can still create shared data either locally or using a cloud account. Fast switching is possible, use different backgrounds to help determine which account, or even show input for login window if you don't want to list all your accounts.