Interesting for me, I’ve had two drive failures, both in the past year, but otherwise nothing for the past five+ years. Both were data center class drives (Seagate Exios) and died within the first 2 months of purchasing them. I have over 20 consumer grade drives with >50,000hrs of reported power on time, of which 3-4 are >70,000hrs. They constantly see writes, but I’m definitely not pushing max IOPs by no means on a regular basis. I’d say around 1-2% of the time they are under very heavy read/write activity, otherwise just constant appending of data at around 50Mb/sec across the entire RAID pool.