I had moved everything out of my dorm and I forgot my SD adapter so i could use the media bay on my laptop. So I was bummed but then I realized I still had that adapter that came with the R4 laying around, so I thought I would use it for the first time. So I plug it in and I was going to put some music on my Kingston microSD card (Non-Japan) and it reads it all. I moved some files around and everything was alright. Then I put in my Kingston Japan card to put different games on and BAM, right when I plug the USB adapter in again it freezes my laptop and i had to manually turn it off. So then I put the card in my R4DS and it just says "Loading... " on the top screen and just stays there. When I got back to my desktop and had the SD adapter I tried using that and it won't read the card either. It says that there is no media in the drive. It also won't let me format the card again as it won't even recognize that it's plugged in. So I'm not sure what I should do. It really sucks though cause it had all my save games on it and I didn't back them up at all. So that really screwed me over. Has anyone else had this problem?