few days back i have completely formated my hard disk with the help of seagate seatool.Then i have installed windows xp sp3. i have made 4 partitions at that time ie. c,d,e,f. After that i have installed windows 7 now i cant see my hdd in disk management or in device manager. both device manager & disk management are showing me my external drives like pen drive. so what may be the problem. plz help me.