so i am using my friends mac, i am a pc person and dont know crap about macs lol, i hooked up my external hard drive to the comp mac, it will let me read the things on the hard drive but if i want to add things from the mac to the external hard drive it says i cant, because it cant be modified, i went to file then get info clicked on owenrship and permissions and it says i can read only, but i want to write, is there a way to fix that or is it not possible because its a external hd from a pc and mac wont let me write? any help is appreciated, thanks