External harddrive. hi i was formating my pc with windows ex ,after i formated it now it doesn't

Question

hi i was formating my pc with windows ex ,after i formated it now it doesn't detect my external hard drive, i unpluged it and to try it again i hear it its but i dont see it in the box with C drive.. i tried with my laptop same thing i hear it but dont see it please help tony [e-mail]