Games don't have to be super optimized to use the Xbox Series X's SSD.
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Xbox Series X SSD natively reduces loading times by 77%
HDD vs SSD on Xbox One X. For those who are considering upgrading their consoles. : r/xboxone
Microsoft details how Xbox Series X will load 4.8GB/s from memory
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Xbox SSD? Do this to cut your load times almost in half!
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others. Recovering data from SSDs –
Why does the Xbox Series X 1TB drive only have 802GB of usable space? - Quora