I recently bought a 4gb PNY SDHC for my camera, and i want to know if it can be used through any card readers.
Secure Digital High Capacity :) your card reader must be one as well or you risk malfunction. I have one in my phone 8GB and i can use it on an older card reader, but it messes up half the time, during file transfers. If i hook up through the phone directly its ok. but 3 different older card readers dont show anything. it will work but be careful :P