1. Make Backups
Before we change partitions of our harddrives we need to make backups to be able to restore our data in case something goes wrong.
2. Shrink an existing partition
In case we don’t have an unpartitioned space on our drive we need to make some space for the new partition, else proceed with step 3:
Boot a live session (“Try Ubuntu” from the installation CD)
Only unmounted partitions can be resized. We can not unmount or change a partition in use
Run GParted
Open the Dash and type GParted to run the graphical partitioner from the live session.
Select partition to shrink
Click on the partition we want to shrink (take extra care that the partition is really the one we want to change). Then choose Resize/Move from the Partition menu:
enter image description here
Define size of the new partition
In the window that opens use the mouse to drag the right side of the partition to the desired size or give in appropriate values in the textboxes below:
enter image description here
Apply changes
We can now go further to step 3. below to create a new partition formatted as NTFS or we apply these changes to leave part of the disk unpartitioned:
enter image description here
3. Create a new partition
In case we have an unpartitioned space on our disk we can partition ii with the disk utility or run gparted Install gparted (we need to install it only when we are not running a live session) to select the unpartitioned space. From the right click menu choose New:
enter image description here
Select ntfs (or any other format) from the File System dropdown menu and optionally choose a sensible label for this partition. Click the green tick to proceed.