so kev i had one of those 16mb sd cards that you get free with a camera knocking about - thought i'd try that as its tiny, has no pics etc on it and also will nulify the whole limit of the card issue - formatted the card on my laptop then stuck just one song on the card - stuck it in the car and it came up......'sd card error'. (unt. now i'm getting worried its the unit that's faulty and its got nothing to do with the cards. any further ideas?
Ohh, interesting. I wonder I wonder.
Erm, ok, I can only think of one other option.
Does the 510 have an option to format the card once its inserted ? i.e. Like in the menu somewhere where you can format it ? It 'may' be that the 510 requires to do the formatting before you then put your mp3's on it, but I very much doubt it.