all worked fine, until i restarted my laptop 20 minutes ago. when it restarted this popped up. it shows in disk utility but i cant mount it, when i click that nothing happens. if i click verify it tells me to repair and if i click repair it tells me it cant do it and i need to reformat. its the original 500gb apple hdd, 2 months old. anything i can do to avoid reformatting? or at least any way to recover data?