How can Ubuntu Dash find files & folders which are not in my home folder?

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http://askubuntu.com – Though through dash i can find all my file & folders which are in my home folder partition of my hard disk. But in one of my hard disk partition i have kept all my movies, & i cant never find them. If they appear they only appear as recently played, but i want them to show permanently, like they show from my videos in home folder. (HowTos)