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WD unveils massive 2TB SSD for Steam Deck and PC handheld owners
(www.pcgamesn.com)
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Don't have a steam deck, but what I used to do on Linux when upgrading drives is just dd the old drive over. Sure it's inefficient as hell, but with pcie 4.0 speeds You're looking at 20 min to make a byte-for-byte copy of your old 1 tb drive, which you can then extend your partitions to make them bigger.
Nowadays just using cat to clone drives is almost always faster