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IMO anything below say a WD Red Pro is just a trash drive. The unrecoverable read error rates on the lower model drives is usually junk. I'm seeing the 8TB on NewEgg for $280 so you're looking about 3x.Re: performance vs. capacity
Here capacity = price, and at $900 this would still be 5-6x the cost of mechanical drives. So no, not close to the "best of both worlds."
Then factor in the spiny drive reliability even then is poor compared to a SSD and the performance is also not remotely comparable. 3x is pretty reasonable to me. Would I rather have 1x 8TB SSD than 3x spiny 8TB? That's now a tough question to me.