so i have a pc formatted hard drive and no pc in sight. ive sucessfully moved the files i need from the hard drive to the mac but now i NEED to delete them asap!!!!!! like there are files there that need to be deleted/corrupted/whatever before i leave tomorrow as i am going to rome for 3 months and some of the files on the hard drive contain very personal information that i need to get rid of. but not all of the hard drive. only some files. so i need to know what i can do to get rid of files on an external hard drive that was formatted for PC using only a mac. please help me quick!!!!