Hello, i have a seagate harddrive and i went to plug it in to my mac for the first time and time machine came up which ive never used before and then i clicked a few buttons to get rid of it and all i could see was erasing...so i cancelled and unplugged it but i cant see any files watsoever on my mac>>>please help what has happened to all my files on the external hardrive its smaller than my mac hardrive by the way?