Step 1
Click Start, right click at Computer. Then choose Manage. A new window will shown.
Step 2
Click Disk Management, please keep attention to the red boxes (especially at the under).Step 3
Right click at unallocated drive, than choose New Simple Volume...., a New Simple Volume Wizard dialog will shown.
Step 4
Specify the size of new volume that you want (in my case, I type 20000 to allocated the size of new partition, that mean I want to make a new partition that have 20GB of size).Step 5 - Assign the following drive letter:

Step 6 - Setting up the format of the volume
Click Next, then new window will shown. Click Finish.
Step 7 - Formatting..
When the formatting is done, new partition will created. Congratulations!! Your new partition ready to use.
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