SanDisk SDCFX4-4096 4GB Extreme IV CompactFlash Card Large 4GB Capacity Read and write performance of 45MB/s with ESP Technology Built to perform in the most extreme environments and temperatures&#8212;from -13 F to 185 F Durable, reliable and thoroughly temperature tested (heat and cold); shock and vibration tested (industrial-grade RTV included for CompactFlash) Priority toll-free technical support