The IronWolf Pro 16TB Internal 7200RPM Hard Drives are relatively speedy, and reliable so far. I have four (4) of them in a server 2 exp with 2 raiding the first 2. The Drives do hold a lot of movies, tv shows, music etc. The one downside is that the drives are real noisy. I don't mean you just hear a hard drive once in a while, if you have a raid set up using these drives it seems as though they rattle and hum all the freaking time. I have them in a Synology NAS unit.
Pretty fast for a physical disk drive. Only con is that these drives are a little on the noisy side. Using in a 4 disk raid 10 setup, otherwise performs as expected.