I'm sorry this probably should be brought to a PC forum but I dont know any.. if its not appropriate please delete. I have an external HDD but its format is Mac OS Extend Is that why when I plugged it into my PC it doesnt respond at all? I know they use different filing systems, is there any softwares/application for PC so I can use my HDD on my PC without having to have all my files on it deleted?? Or no matter what I'm gonna have to have everything erased...? thanks!!