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
The World's Biggest Micro SD Card - Integral 512GB Micro SD - YouTube
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5 Best MicroSD Cards 2022 | The Strategist
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SanDisk 256GB microSDXC UHS-I Memory Card for Nintendo Switch SDSQXAO-256G-ANCZN - Best Buy