ok, this topic didn't have any related to DS. I don't know where to put this topic, so i just put it in here, because this forum discuss about micro sd, and it probably have the same solution for my problem. So i have a 4GB mini SD Topram. last night after tranfering video to my mini sd, the file got corrupted, and the mini sd show that i have been used the 512mb, but there's no folder or files in the mini sd. so my mini sd like 3.5GB now. then somehow now the memory capacity show that 3.6GB used space, and only left about couple MB free space. I need help to recover my mini sd to 4GB again. I don't care about the files, i just want my 4GB free space again.