Formatting an external harddrive with TrueCrypt as NTFS?
I don't think you can format your external hard drive as NTFS using TrueCrypt -- in my experience it can only be done from a PC. I also work with macOS and Windows, so what I did was to use the Portable TrueCrypt for Windows on a PC, and then I was able to encrypt the external NTFS-formatted hard drive with TrueCrypt. The advantage of using the Portable TruecCrypt for Windows is that the program doesn't have to be installed on the PC, and the TrueCrypt volume can be mounted on both OS. Hope this helps!