SanDisk Extreme III CompactFlash is designed for serious professional photographers who demand one of the fastest, most rugged, and most durable memory cards on the market. Professional photographers who work under less than ideal conditions expect more from a flash memory card. More speed. More performance. More reliability. SanDisk’s new Extreme III card delivers everything you want plus a whole lot more!. That’s because only SanDisk Extreme III memory cards feature innovative ESP Technology for the fastest speeds and highest performance. ESP stands for “Enhanced Super-Parallel Processing”.