Has anyone managed to find any 4GB SD that will work with the RNS-E? I know they are only compatable with standard SD cards and not HCSD cards, which is a bit of a shame considering the age of these cars. However I have searched high and low and found some non HCSD 4GB cards but they wouldn't work either. So has anyone had any luck with 4GB cards? and where did you get them from?