Please guys can one of you help me i have a 4gb sdhc card, i have formated it to default on vista fat 32, put it in the n900 and can not see it. why? what have i done?

i also downloaded the free ovi trial sygic maps it runs ok but i can not see any of the related folders to add my custom poi's into.

I have now purchased the full eu version and because i could not see the trail on the phone memory i decided to buy a sd card to install the sygic map software onto so i could add my custom poi's.

as i can not see the sd card in file manager what do i have to do??