so i just got me HD for making back up for my macbook/pc it works for mac/pc plug and play works fine..but now that i reformat it using my macbook for time machine when i plug the hd back to my PC it dont read it? how can i fix it back to normal? so that it work for both? it didnt come with a set up cd it was inside the HD whice i did made a copy of.. so formating to use time machine means that my external HD is only for my mac now? cant plug it to any pc then? will i have to buy a new hd?