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400 GB is no longer the biggest microSD card available. As of some time in February 2018, there will be a (very likely expensive!) 512 GB microSD card on the market! : r/gpdwin
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Sandisk Ultra Micro Sd 1tb 128gb 32gb 64gb 256gb 400gb Micro Sd Card Sd/tf Flash Card Memory Card 512gb 128 Gb Microsd For Phone - Memory Cards - AliExpress
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SanDisk 512GB Ultra microSDXC UHS-I Memory Card with Adapter - 120MB/s, C10, U1, Full HD, A1, Micro SD Card - SDSQUA4-512G-GN6MA
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SanDisk 128GB microSDXC UHS-I Memory Card Licensed for Nintendo Switch, Red - 100MB/s, Micro SD Card - SDSQXBO-128G-AWCZA - Walmart.com
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