Then I’ll describe a quick and easy tutorial on how you can create a new partition splitting your C: drive.
First of all I recommend that you defragment your drive C:. Open the Start Menu and click on Computer. Now click the right mouse button on the hard drive C: and choose Properties from the context menu. Go to the Tools tab and click the button Defragment Now. In the Disk Defragmenter window, make sure that the Drive C: is selected and click the Analyze Disk. When finished scanning, click Disk Defragment. Grab a cup of coffee because this may take some time.
Back it’s time to perform the main task.
Click the right mouse button on the disk you want to partition and choose Shrink Volume.
In the window that opens enter the amount of space to shrink in MB.
Note that after confirming the previous operation, you will see the partition divided and shown as unallocated space.
In the final step, click on the unallocated space and choose New Simple Volume to open the wizard. Click Next. Select “Assign the following drive letter” to the letter you prefer. Choose the NTFS file system and choose the allocation unit size as default too. If you’re in a hurry, check to perform a quick format. It is still possible, if you wish, to enable compression of files and folders selecting the right option. Click Finish.
In the Computer Manager find your new partition ready for use.