hi i am new to this and 18 about to go to uni next week so i need some help and FAST! i bought a 320gb hardrive in june 2010 and it was perfect i made a back up of my whole HP system. However a friend of mine plugged my hardrive into her apple mac and i think my hardrive must have synced to her hardrive called time machine or something like that and now i am trying to use my hardrive in my hp laptop it wont work. ive tried everything it wont show my computer i searched for help all over the net and with technicians on the phone saying to go into disk management and its not there either. One techinician was sayin i might have to reformat it on the mac. this cost soo much money and i cant afford to buy another one nor can i afford to lose all my data on this one.. please is there a genius out there that can help me!!!!!!!!!!!