Steam Deck has M.2 2230 SSD slot, but Valve does not recommend upgrading it - VideoCardz.com
Transcend 512GB M.2 2230 NVMe MTE300S
Amazon.in: Buy Western Digital 1TB SSD PC SN530 M.2 2230 PCIe Gen3 x4 NVMe 1024GB SDBPTPZ-1T00 Online at Low Prices in India | Western Digital Reviews & Ratings
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Kioxia Updates M.2 2230 SSD Lineup With BG5 Series: Adding PCIe 4.0 and BiCS5 NAND