.nomedia will cause whatever directory not to be scanned for media. By being in the root it won't scan the entire sd card. If you have a folder you don't want scanned put it in there, otherwise create a folder just to keep it out of the way.

 

Sure can, but i thought it might be prudent just to move it to where you know it's location in case, in the future the OP wanted to block a folder from being scanned. It's usually easier to copy an existing file than create a new one.

I realize that .nomedia is just an empty file, but many don't understand that or know how to create an empty file.