hi guys i have a q's for 550D owner
i'd experienced with my 550D when i was play back my photos via camera then ERROR message came out.

Then i'd tried to turn off the camera and clicked play back again and all the picts GONE~~ after that i used my laptop to read the memory card and it shown up need to format my memory card.

i'm using KINGMAX 8GB SDHC memory card now
any sifus can tell me what happened with this problem or anyone has encountered this problem before.