WD Blue, Green, or Red for separate media and backup drives?

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I'm looking to put a 4TB secondary hard drive into a living-room computer connected to a TV to be used as a media drive (movies, TV, music), then attach another 4TB drive through USB as a backup, and both will go through an ethernet cable to other computers on the (wireless) router network.

I like Western Digital's drives but I'm not sure which colors would be optimal for my setup. I want the internal drive to be quiet but I don't want lagginess over the network for media.
 
Solution
Green = eco
Blue is medium line
Red = NAS

For streaming use, any of them will be fine. The red nas series are designed for more repeated access use so they would far better, but the bennifit to cost difference when it comes to home use is little to none.
The green series are slower drivers (5400-5900rpm vs the normal 7200) but for backups/movies purposes they are faster then gigabit and even faster then the bitrate needed for a 4k movie.
Green = eco
Blue is medium line
Red = NAS

For streaming use, any of them will be fine. The red nas series are designed for more repeated access use so they would far better, but the bennifit to cost difference when it comes to home use is little to none.
The green series are slower drivers (5400-5900rpm vs the normal 7200) but for backups/movies purposes they are faster then gigabit and even faster then the bitrate needed for a 4k movie.
 
Solution