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SSD capacity could quadruple by 2029 — 8Tb NAND will bring big and affordable SSDs to the market
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
GP was wrong about tapes, but plenty of these systems use hard drives already. They can use specialized drives that are cheap and have slow write speeds, because streaming video is a constant rate per second. They also don't record unless there's movement. The network is also a limiting factor.
I don't think SSDs solve any problem, here.