This drive can be used with either a Mac or a PC. It comes formatted to be used with a PC, if you wish to use it with a Mac, it must be reformatted, which wipes all the data. You would not be able to use this drive to move files from a Mac to a PC or vice versa. If you're thinking you might switch back to a PC someday, you'd have to reformat the drive to work with the PC, but you wouldn't have to buy a new drive.