TIP: Permissions When Mounting NTFS Partitions in Linux

Found here

Replace your custom line in /etc/fstab for this one:
/dev/hda5 /mnt/windisk ntfs umask=0222 0 0


And when you’re mounting it manually, use this command:
sudo mount /dev/hda5 /mnt/windisk -t ntfs -o umask=0222


That will fix things.
More info. on http://ubuntuguide.org/#mountunmountntfs