to mount a hard drive (partition) permanently you will have to create a new directory and add a line to your /etc/fstab file:
in a terminal type:
then you should check the drive notation of the drive (partition) you would want to mount by opening gparted or qparted, install this if you do not have it on your system, should be in the repositories. On my system the drive notations are all sdxy (where x = the letter of your drive and y = the partition number) but on other systems this could be hdxy, that's why you have to check.
then once you have confirmed this info you can copy and paste this line into the static section of your /etc/fstab file as a root:
/dev/sdxy /wxp ntfs-3g defaults,umask=000,uid=1000,gid=100,auto,rw,user 0 2
changing the drive notation before you save it to whatever your system has assigned it (good chance it is /dev/sda1 or /dev/hda1) and reboot.
this will give you full read and write access to that drive which you will find in the newly created /wxp directory.