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
Markings: speed, size and class | Understanding microSD and SD cards: speeds, markings and more | Adafruit Learning System
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
Best microSD cards of 2023: Speed, capacity, cost compared | ZDNET
New SD card specs tout 128TB max, up to almost 1GB per sec - CNET