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Amazon.com: SanDisk Micro SDXC Ultra Class 10 UHS-1 512GB Memory Card Works with Nintendo Switch OLED Model Gaming System (SDSQUA4-512G-GN6MN) Bundle with (1) Everything But Stromboli SD & MicroSD Card Reader :
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Nintendo Switch's storage could be expanded with USB drives - - Gamereactor
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Amazon.com: SanDisk 400GB Ultra microSDXC UHS-I Memory Card 100MB/s, C10, U1, Full HD Works with Nintendo Switch Neon Video Game Bundle with (1) Everything But Stromboli Memory Card Reader : Electronics