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This new 40TB hard drive from Seagate is just the beginning—50TB is coming fast!
(www.techradar.com)
This is a most excellent place for technology news and articles.
I upgraded my 7 year old 4tb drives with 14tb drives (both setups raid1). A week later, one of the 14tb drives failed. It was a tense time waiting for a new drive and the 24 hours or so for resilvering. No issues since, but boy was that an experience. I've since added some automated backup processes.