Changes

To format the unallocated partition select it by clicking on it in the list and click on the ''New'' toolbar button. The following ''Create a new partition'' dialog will appear:

Unless you wish to create multiple partitions, want to leave some unallocated space or need a filesystem format other than ext3, leave the settings as they are. This will use the entire space for the partition. Click on ''Add''. The action will be listed as 'Pending''. Click on the ''Apply'' toolbar button to commit the change. The new ext3 partiton will be created.