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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.
doubt it would matter much, if you need long term storage you're using LSO tapes anyway.
HDD might be nice for a bulk backup or just mass storage, but i think the primary driving factor for them is going to be cost.