Hi guys, I have one sony camera (w230) that was working just fine, but suddenly appeared the message "13:01 reinsert the memory stick". I thought that it was a problem on my 4gb memory card (brand:Sandisk), but i tried to use this memory card on another sony camera and it worked!! So, I tried to use a old memory stick (512mb - brand: sony) on my new camera and it worked, too!! Soooo.. I too confuse... Why my camera does not recognize anymore my 4gb memory stick?? But recognize the 512 mb??? And it was working before....!!!!! I am thinking if the problem is with the brand (Sandisk)??? But if it was, why the sandisk memory stick was working just fine before?? I bought a new Sandisk (2gb) and it isn´t workind also!! Pleaseeeee..help me!!! =)))