Built to meet the demands of photographers and passionate shutterbugs who are using advanced cameras and HD camcorders, the 64GB Extreme UHS-I SDXC Memory Card from SanDisk allows users to take advantage of functions such as fast action shots, continuous burst mode, and multiple frames per second. It features a capacity of 64GB, is compatible with the UHS-I bus, and delivers maximum read speeds of up to 90 MB/s and maximum write speeds of up to 40 MB/s. This Extreme UHS-I SDXC card supports the V30 speed class, which guarantees minimum write speeds of 30 MB/s. If your device does not support the V30 speed class, this card also supports the U3 speed class, which likewise guarantees minimum write speeds of 30 MB/s. If your device only supports the Class 10 standard, minimum write speeds are guaranteed not to drop below 10 MB/s.