I have several WD hard drives. A green, a blue, and a black one. The blue one I use as a media drive (music, images, and videos). Its read / write speeds are decent and it doesn't run too loud. The black one is slightly louder than the blue (not that loud though), but it's read / write speeds are slightly faster. I use the black drive for gaming (storing game library and gaming clients). The green drive has lower read / write speeds. I'd class the green drive as a basic range hard drive. I use the green drive to store my OS and some programs on. To Summarise: Black > Blue > Green The are also red and purple drives. I believe these are designed for enterprise storage and surveillance storage.
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