I have an iMac at home and a PC in the office and want to be able to write/read to a usb flash drive from both, but to have the drive secure so that its files can't be read. Is there some way password protect the entire usb flash drive, yet be able to read it and write to it from both the Mac and PC? If that can't be done, would a usb flash drive with hardware encryption allow me to read/write to it from both? Thanks in advance for any advice.