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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.
The actual shells and manufacturing costs aren't going down meaningfully. Giving you more for the same price is how consumers benefit the most. Especially because consumer demands for storage (among people willing to buy any, at least) keep going up and there isn't a big market for HDDs that are half the price but 1/4 of the storage.