See also this blog post from 2016 by Backblaze about the SMART stats they use to predict hard drive failure: https://www.backblaze.com/blog/what-smart-stats-indicate-har...

Relevant because too many different metrics can be hard to make sense of and derive value from. Backblaze have a lot of hard drives. Like a lot a lot. https://www.backblaze.com/blog/how-backblaze-buys-hard-drive... (2019)