ntfs-config program allow you to easily configure all of your NTFS devices to allow write support via a friendly gui. For that use, it will configure them to use the open source ntfs-3g driver. You'll also be able to easily disable this feature.
Note:- If you are using laster ubuntu versions this driver was included in default installation
Install ntfs-config in Ubuntu
Now You can install ntfs-config from Ubuntu repositories
sudo apt-get install ntfs-config
This will install all the required packages for ntfs-config including ntfs-3g
or if you are using ubuntu 9.10 click the following link from your firefox
Once installed open this application System--->Administration--->NTFS Configuration Tool if you don't see there try from Applications--->System Tools--->NTFS Configuration Tool
Now it will prompt for password enter password and click ok
It will show the available NTFS partitions as follows in this example /dev/sda2,/dev/sda3 are available NTFS partitions
You need to select the partitions you want to configure,add the name of the mount point and click on apply.In this example i have ticked the check box next to /dev/sda3 and click under mount enter the name you want to use i have entered as OS and click on apply.
Select the NTFS Write support which is suitable for you i.e internal or external.In this example i have tick the check box next to Enable write support for internal device because i am using dualboot with windows vista.If you are using external hard drive select external option and click on ok
Once it finished you should see the mount point on your desktop as follows
You can see the windows vista mount point files as follows
If you want to unmount you should be root to unmount and then right click on mount point select Unmount Volume