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Toshiba exec claims hard drives are 7X cheaper than SSDs and will continually evolve for large datacenters
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
A 16TB, a single one, right now is $1800.
As I said, as they become available (read: affordable) then I'll use them. Until that point.. mechanical drives have worked well for 50 years and are fine for me. I can accept a margin of problem, it's the reason I use RAID.