After weeks of googling, I think this thread may be the solution I'm looking for. I have a WD Passport, formatted as FAT32. It works on both my imac and windows pc, only when I copy files to or from the drive in windows, it's lightning fast, and when I plug it into the imac copying files from the external drive to the imac is painfully slow. I need to use the drive on both the mac and pc, so formatting as NTFS and then downloading the mac NTFS-3G driver...will this solve the speed issue? Please, please, please someone let me know, this is driving me absolutely crazy!!