I got a 4GB AData card from NewEgg. It started producing errors. They sent another one in replacement. This one still holds, but it takes like 5-6 seconds to flush buffers after I press Stop (I have the SD1 camera). The original Panasonic 4GB card takes less than 2 seconds. I have bad feelings. I short, I'd say that AData cards are crap. Anything other should be better, for example, PQI.