Seagate has introduced the Exos M series, a range of enterprise-grade mechanical hard drives available in 30TB and 32TB capacities. The two models, the 30TB CMR ST30000NM004K and the 32TB SMR ST32000NM003K, each offer a minimum of 3TB per disk and use a standard 3.
Seagate in general are unreliable in my own anecdotal experience. Every Seagate I’ve owned has died in less than five years. I couldn’t give you an estimate on the average failure age of my WD drives because it never happened before they were retired due to obsolescence. It was over a decade regularly though.
HDD is unreliable with all those moving parts and arms and cilinders.