converting unallocated space to free space

I shrinked E: which was a primary partition and the shrinked part resulted into unallocated space.while changing it to free space i got an error that your partition count has reached maximum,How can i convert it to free space.I am sending the snapshot.

 

There can be only four partitions in a basic MBR disk. One of them can be an extended partition, with multiple logical partitions contained in it.

It seems that you already have four partitions. If by "free space" you mean another primary partition, it is not possible to create it. You could create another logical partition, or delete one of the others and create a new primary one including the unallocated space. Or use another partition manager to combine the unallocated space with one of the existing partitions. Be careful with these operations, back up the existing partitions before doing them.

 

uma,

You can remove the 100 MB System Reserved partition. Then you will be able to create another primary partition.

http://www.terabyteunlimited.com/kb/article.php?id=409

Or, you could slide the Extended partition to the left, resize the Extended partition and create another logical volume.

But the basic question is; why do you need another partition?