1 Right click on My Computer Icon on desktop
2 Select Manage
3 Click on Disk Management

NB: Unallocated will be shown as black means there is no any drives in it
       Free Space will be shown in light green there is nothing in it
       Primary Partitions will be shown in dark blue color we can only create 4 primary partitions
       Extended Partitions will be shown in dark green color we can create many logical drives in extended
partitions
       Logical Drives will be shown in light blue
                                    To Delete a Partition

1 Right click on the drive that is to be deleted
2 Select Delete Volume
3 A dialog box will be appeared click on option yes to delete (if you delete the partition including OS then your OS will be gone)
4 then it will be free space (light green)

                                   To Create a Partition

1 Right Click on free/unallocated space
2 Select New Simple Volume/new primary partition
3 from the appeared box give size of drive,give drive letter if needed select drive type and necessary things
4 after all click on finish your drive is created