Root is the Admin so you need to add the "sudo" (Super User Do) command in front of the command like such:
sudo mount -t ntfs -3g /dev/sdf1/media/disk -o force
It may prompt for a password its the password you use to login.
but forcing is dangerous, if it fails you may not be access the data from either windows or linux ever again.
try doing as listed using "Safely Remove Hardware" in windows but leave the drive attached and powered on while shutting down windows and booting into Ubuntu.
Edited by BlackSpyder, 02 March 2009 - 12:56 AM.