The 64GB AV Pro Mk 2 UHS-II SDXC card shares Angelbird's V90 Video Speed Class rating, built for Full HD, 4K+ and 3D video plus raw and continuous burst photography in DSLR and drone systems. Over the UHS-II bus it sustains 280 MB/s read and 260 MB/s write, with sequential speeds of 300 MB/s read and 280 MB/s write, and the V90 rating guarantees a minimum write speed of 90 MB/s.