man, I starting to think your starting to just do a lot of short post just to boost up your status. I have answered your questions already in other threads, next time you ask questions, GIVE DETAIL and DO A SEARCH BEFORE YOU ADD A NEW THREAD. I assure you most of your questions can be found in earlier threads if you give a little look
deezp1 is right... I'll be nice and answer your question, yes you can upgrade your HD, but you need either mod chip or a soft mod to do it. Otherwise you will get an error message if you try to change it without doing one of the two things above.