SanDisk introduced the new SanDisk Extreme IV line of CompactFlash digital film cards for professional photographers. The line is targeted at photographers who require the highest possible performance and the largest capacities for their medium format and high-end digital single lens reflex cameras. The SanDisk Extreme IV cards are available in capacities of up to 8-gigabytes and deliver minimum read and write speeds of 40 megabytes per second, making these the fastest flash memory cards in the world. This exceptionally fast card speed is critical when shooting large numbers of high-resolution images.