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
SanDisk® High Endurance microSD™ Card Class 10, Dash Cam Memory Card | Western Digital
The World's Biggest Micro SD Card - Integral 512GB Micro SD - YouTube
SanDisk 1TB microSD card review: Insane storage in a fingernail size | Mashable
SanDisk 32GB (Pack of 2) Ultra microSDHC UHS-I Memory Card (2x32GB) with Adapter - SDSQUA4-032G-
Amazon.com: SanDisk 1TB Extreme microSDXC UHS-I Memory Card with Adapter - Up to 160MB/s, C10, U3, V30, 4K, A2, Micro SD - SDSQXA1-1T00-GN6MA : Electronics
The Best Micro SD Cards For The Nintendo Switch - GameSpot
SanDisk unveils world's largest microSDXC card with 400GB capacity: Digital Photography Review
A beginner's guide to memory cards: Digital Photography Review
SanDisk's 1TB microSD card is now available - The Verge
World's highest-capacity microSD card can store more than one million floppy disks | TechRadar