Hey im a newbie with mac & would appreciate all help. i tried searching the forums but everyone was talking about things which were too confusing to me. i have just recently bought an external hdd. I added my data from my mac. however, whilst trying to access the hdd from a windows pc, i realised My external HDD is only accessible on mac & nt windows. plz help. will i be able to make the hdd compatible with both my mac and windows pc without losing my data? also my friend has an hdd which she uses on her windows pc. im able to transfer files from her hdd to my mac but whenever i try to transfer files from my pac to her hdd it says the hdd cant be modified. i checked info and the hdd wasnt locked. I tried to check and change sharing&permission in disk utility but all options are invalid. thanks in advance for all help.