The SanDisk Extreme PRO USB 3.1 Solid State Flash Drive delivers super-fast solid state performance in a USB flash drive. A game-changer in the USB storage category, this flash drive offers read speeds of up to 420MB/s and write speeds of up to 380MB/s1 that let you transfer everything fast. With capacities up to 256GB*, there's plenty of room to easily manage massive files. The sophisticated aluminum design is both stylish and durable, and the included SanDisk SecureAccess software, with 128-bit file encryption and password protection, ensures that your private files stay private4. Plus, the SanDisk Extreme PRO USB 3.1 Solid State Flash Drive is backed by a limited lifetime warranty6 for added peace of mind.