I'd note a couple things: 1. 2 failures across 1.5M hours is something around a 1.2% AFR, which is good, but not significantly below Backblaze's average. Defin

I'd note a couple things: 1. 2 failures across 1.5M hours is something around a 1.2% AFR, which is good, but not significantly below Backblaze's average. Definitely better than the stats on their worst drives. 2. Assuming some premium for higher-reliability drives, and some required storage growth over time, the most efficient drives to buy are those that fail at exactly the rate that lets you replace them at with higher-capacity drives as needed for storage growth. I'm personally at the point where I'm decommissioning 2TB drives with 100k hours; I'd be better off having saved some money and having the drives fail now.