sd card problem tomtom go

Hi i bought an sd card and tried to copy the sd card in my tomtom go to use as a back up card but it dosent work in the tt i have tried everything formatting the card copying in card in a reader dragging and dropping nothing seems to work any ideas?
regards
andy

Hi,
I used the tom tom software that came on the CD I got with my Go 300 to backup the original sd card and then restore it to a different sd card. This worked.
Cheers
Enrico