For those looking for a MicroSD card to install in Roku 3, this does NOT work I've tried several times, deleted, reformatted. Roku just won't see it. The card itself seems to work fine when connected to a PC, but FYI the Roku 3 is no good.
Memory card Samsung microSDXC 256 GB Class 10, V30, A2, UHS-I U3, R 130 MB/s, adapter to SD
50 Review
32GB High-Speed Micro SDHC Card - Class 10 UHS-I Compatible Memory Card for SD Devices
63 Review
Kingston microSDXC 64GB Class 10, V10, A1, UHS-I U1, R 100MB/s Memory Card, SD Adapter, 1 pc, Black
45 Review
π½ 512GB Samsung Evo Plus Micro SDXC Memory Card
40 Review