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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.
Seagate Exos is usually ok. Their generic stuff, is sometimes crap, but that's true of all manufacturers, really.
That being said, I'd be nervous with a single huge drive, no matter where it's from. And even as part of a redundant structure, the rebuild times would be through the roof.
exos are fine if you don't mind them being loud as hell.
They're not really meant for desktop use, so not really an issue. Also don't keep your servers under your bed, the ventilation is quite bad.
Yup, if you can put em in a closet or something, you're golden.