Enable NTFS read / write in MacOS Sierra for FREE
[open Terminal.app and run the following commands]
/usr/bin/ruby -e “$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
brew install caskroom/cask/brew-cask
brew install Caskroom/cask/osxfuse
brew install ntfs-3g
[Reboot by holding CMD+R to get in recovery mode]
choose Utilities>Terminal in the menu bar
sudo mv /sbin/mount_ntfs /sbin/mount_ntfs.orig
sudo ln -s /usr/local/Cellar/ntfs-3g/*/sbin/mount_ntfs /sbin/mount_ntfs
[reboot by holding CMD+R to get in recovery mode]
You might need to unplug/replug in your external hard drive and it should detect and show up under Devices.