I have a seagate 300mb external usb disk drive that was perviously connected to my old pc (windows xp). Due to a disk problem I had to format it for use with an apple macbook. I now no longer need it for the apple and want to use it with my new windows 7 machine. After connecting the disk, its recognised but I cant access it at all. I want to reformat it, but I dont have the option, in computer manager it doesnt even show up, yet it is in devices & printers. Im new to windows 7, so can anyone help me out ?