I bought a 4Gb card from Grassroots and it worked in my device but it is VERY erratic in my USB adapter when comnneted to my pc. 9 times out of 10 it would not read the card at all. Also, the Camera program won't run in save to starage card mode if you have more than 2 GB of free space. You can solve the camera problem by partitioning the card but I was never able to see the second partition in a USB adapter.