Re: And then spinning rust
The power and space savings of 60 and 100TB 3.5" flash is hard to beat with spinning rust. I have an affinity with it as well having spent some time up on the hill above Almaden Valley where a lot of good research was done. However, >1 watt at idle vs 8 watts is huge especially when you have to have 10 or more spinning disks to get the same capacity. That's nearly 2RU in a typical 12 disk per 2RU config (though I know you can get denser) and 80 watts vs ONE 3.5' drive and <1 watt for your typical archive storage where it should be idle quite a bit. Even when busy you save power just not as dramatically. Add in the crap durability of SMR and I don't see how spinning disk even competes going forward. if your needs are more in the speed and capabilities range, then MLC is your buddy.
I'm not going to argue about tunneling vs arcing. Call it what you want. It works and is proven. You worried about arcing while you fill your tank at the gas/petrol station and read email?