I have a 16gb class 2 sdcard. I am thinking of getting an 8gb class 6 sdcard. I know I will need to make it a goldcard but if I do will I be able to still use the 16gb one? Are there any problems changing from one card to the other? The reason for changing is to hopefully get a better sync between sound and video on the BBC News 24 and I doubt if i would ever fill an 8gb let alone a 16gb card.