General data storage. I picked the WD green because I wanted something that was built for efficiency and reliability. Even though it's a slower 5400RPM drive, I knew that for my normal usage that I do not access the "long-term" storage too much during my work flow and that I just need the drive there for keeping things that I need to hold onto but don't necessarily need to interact with every day. It only winds up when I need to access it but quickly lowers power consumption when it's not in use. Basically WD Blue with a different power usage algorithm. Has been great so far and I don't see it being replaced any time soon.
I heard WD is a very reliable brand. 1TB drive for a good price point and it has not failed on me yet. It's been less than a year since I got this, but I feel pretty confident in this drive.
O'll Green has been with me for a long time now but still dependable. I will be shifting to 2.5 drives from now on for the reason that they are small and very lite to carry and consumes less power. I remember my old builds where I have 5 of this in my full ATX case.....it's like going to the gym lifting weights so I can clean it.