I have a new PSP with FW 2.81 (yeah I know it sucks). I recently purchased a 4GB card and now I cannot watch MP4 files on my PSP. I get an error message that says Unsupported Data. When I put the same file onto my 512mb card, putting it in the same Video folder it works without a problem Only when I put the MP4 file in the Video folder of my 4GB card does it give the error message. Any ideas?