SanDisk Extreme Pro - USB flash drive - 512 GB - USB 3.2 Gen 1. 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 420 MB/s and write speeds of up to 380 MB/s that let you transfer everything fast. 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 private.