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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.
depends on a lot of factors. If you only need ~30TB of storage and two spare RAID disks, 3x 40TB disks will be much more costly than 6x 10TB disks, or even 4x 20TB disks.