From SanDisk, a brand professional photographers trust to take on assignments The handy attachment loop made of durable rubber helps you securely attach the external SSD in your pocket, backpack or to your belt loop. So your drive will not be lost Memory for the most beautiful moments. Secure your content and memories with reliable mobile storage solution. [1TB-2TB]: Up to 800MB/s read speed. Write speeds lower. [480GB]: Up to 520MB/s read speed. Write speeds lower. Based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors. 1MB=1,000,000 bytes.