As the leader in high-performance flash technology, SanDisk introduces the newest flagship products – The Extreme® IV line of CompactFlash®. The Extreme IV line of CompactFlash is our 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 45MB/sec*) It provides the highest durability, speed and quality demands on the market today for serious photography.