How to password-protected an external disk on yosemite?

I search for hours but with no results...
I'm searching for a simple and free application that will password protect my external disk I'm moving from one place to another one. There are a lot of free solutions for PC but I have a hard time finding a solution for Mac.
Encryption with disk utility is not a solution for me since my 10.6.8 computer would not recognize the disk.
Moreover, I only want a simple password-protection.
I bought a WD elements and thought I could use Wd security but it looks like it only works with WD my passport (that contains this software) and that WD is preventing WD elements hard disks to be recognized by this application....
I searched the internet and it looks like there is no free solution. Or any free solution is not updated (not yosemite compatible).
Is there a free app ? Or do I have to buy a software (in that case which one would you recommend me)?
Thanks for your advices.

Thank you Kappy but you didn't read all my post. I quote "Encryption with disk utility is not a solution for me since my 10.6.8 computer would not recognize the disk."

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