You may have noticed that in Vista, when you want to create another partition on a hard drive, you do not get options for choosing a primary or extended partition. This was actually implemented to assist the novice users and make it easier for them to create partitions without knowing should they create a primary or an extended one.
First four partitions you create with this tool will automatically be primary partitions, all subsequent will automatically be set as logical partitions.
Now, if you still need a finer control over this and create say one primary and one extended partitions and not two primary partitions, you can use a Diskpart Command-Line utility.
Head over to KB300415 and read on how to do so if you need.
