Q: Is there a particular brand of CF cards/size/speed that works best with the 7-Series recorders? There are numerous options available on the market. With such a wide range of CF options available (the actual flash RAM chips come from very few vendors, however) and with the types, speeds, and capacities continuing to evolve, there is no practical way for Sound Devices to keep up with them. Fortunately, the 7-Series recorders work well with nearly all CF type I and Type II cards, including Microdrives. If you are recording high data rates for test/measurement (>96 kHz sampling rates) we recommend the 40x or greater speed cards. These can support higher track counts and sampling rates. If you are recording typical audio rates, nearly any modern card will work well.