Review on 💽 Lexar Professional 256GB MicroSDXC UHS-I Card with SD Adapter SILVER Series - High-Speed Read up to 160MB/s, for Action Cameras, Drones, High-End Smartphones, Tablets (LMS1066256G-BNANU) by Brandon Wynen

I bought these to upgrade some Raspberry Pis and I'm glad I did. Tests with H2testw only showed 126GB, which is fine with me as my applications will never fully utilize the memory. The write speed during the tests was 81 MB/s and the read speed was 89.5 MB/s, which seems to be the maximum for the USB adapter I'm using. More demanding tests may yield higher numbers, although I'd note that advertised "up to" speeds are fantasies for any manufacturer. However, for my application of caching large files on the local network, these cards fit perfectly.