Wendy just called from Xiamen (she went there with friends) and complained that she got a new SD card, and put it into our Nikon D50, and got error message “CHA” and cannot take photo.
I did some research and confirmed that Nikon D50 is incompatible with any SD card larger than 2G.
P.S. I posted a short message on my twitter about feeling like being caught by flu, and got many response. I am feeling better now.