As the leader in high-performance flash technology, SanDisk introduces the newest flagship products - The Extreme IV line of Compact Flash. The Extreme IV line of Compact Flash is a newest digital film cards for the high-end professional photographers, who require the highest possible performance and the largest capacities for their medium format and high-end digital single lens reflex (SLR) cameras. It has extremely fast read/write speeds (Up to 40MB/sec). It provides the highest durability, speed, and quality demands on the market today for serious photography.