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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.
Amazon is using trucks to ship hard drives for the largest data transfers. It's more efficient than doing it over internet. They also offer a service where they will put the data you want in a drive, mail it to you, and after you're done, you send the drive back.
https://aws.amazon.com/snowball/