Western Digital’s HDD series currently has six colors: Blue, Green, Red, Purple, Black, and Gold. At first glance, all of these colors could be confusing. That’s why we have created this article to explain you the difference.
All of these HDDs are made for different purposes, so it’s important to choose the best fit for your needs. Imagine footwear – you can walk with both sandals and winter boots, that’s true. But it may be wiser and more efficient to use sandals when you’re in beach and boots when there is snow. The same thing goes with HDDs.
Copied from https://goo.gl/hGa0Bv
WD Blue HDDs are mainly used for general purpose storage, they are great all-rounders, and an average user can’t go wrong with Blue.
WD Green is basically the as Blue, but it lacks a bit of performance. However, this is the most eko friendly HDD, and it’s quite cheap.
WD Blacks are for pure performance including gaming, media and content creation. Also one of the most expensive HDDs.
WD Red is a NAS drive. It’s optimized for NAS systems.
WD Purple is for surveillance. Advised for 24/7 operation.
WD Gold, probably the most premium of all. Made for a multitude of Datacenter-specific applications.