To start Disk Management:

1. Just Log in as an administrator or as a member of the Administrators group.

2. And you have to click on the Start button which is situated on the left side of the taskbar, and select the Run command from the start menu and click on it, and type as compmgmt.msc, and lastly click on OK.

3. In the console tree, just click on the Disk Management. The Disk Management window appears on the screen. Your disks and volumes emerge in a graphical view as well as list outlook. To modify how you view your disks and volumes in the upper and lower panes of the window, point to Top or Bottom on the View menu, and after that finally click on the view that you desire to utilize.

Kindly NOTE:

Microsoft suggests that you make a complete back up of your disk contents prior to you create any changes to your disks or volumes.