I'm about to sell my Desire for a Galaxy S tomorrow. However the last time i did a format through the settings, my desire wouldn't even boot. I dont mind keeping the root as is... but want am currently using an 8GB sd card. I want to give the 4GB card that came with the phone.. so do i have to "prepare" the 4gb card in any way? My most important concern is my stuff shouldn't be visible to the buyer... my stuff as in contacts,downloaded apps etc.