I have a S3C2440 single board EM2440-III.
My problem is that when I insert sd card 4G or 8G into the board, it not detect sd card. I insert sd card 2G and work OK. please help me to solve the problem.
I hadn't thought about fakery... very interesting point you are making: do not believe all you read on the Internet?
Yeah, totally not! It goes as anything else: "Trust but verify".I recommend Bunny Huang's (awesome hardware hacker and maker) post on MicroSD problems.
Also Googling "Fake SD Card" shows you the extent of the problem.