32 gb memory stick, you can choose to 8 or 16 g g.This is the conclusion we draw from our customer feedback. We confirm that every memory stick has been tested by staff at the time of issue. Please be assured. Approximate 30MB/s in reading and approximate 20MB/s in writing speed. Transfer speed is about 6 times faster than the Memory Stick(R) PRO Duo. Some devices may not work with this memory stick, we will list the devices that do not work, this is what we get from customer feedback, we will do better