When you try to create a new partition in your hard drive with the windows 7 platform sometimes you will receive a an error message like below:
"You cannot create a new volume in this unallocated space because the disk already contains maximum number of partitions"
Here are the steps to fix this problem.
1. Your hard drive should be converted to dynamic disk then it will allow you create extra partition. In order to convert this, go to Disk Management.
2. Right click on the grey area of Disk 0 and select "Convert to Dynamic Disk"
Now you can create many logical partitions in your hard drive.