How to increase the size of C drive using space from other drives

By default Windows stores all the user's documents, the installed programs and the system files in the C: drive. As a result of this C: drive is the one that gets filled faster than other drives. Once the free space in C: drive (or any other drive) becomes very low, Windows starts to show the above annoying balloon pop up message. How do you solve such a problem? Just read along.
Scenario: The free space in your C: drive is in MB range while any of your other drives (D, E ...) have ample space. Since most of the programs require some space in C: during running/installing, you will find yourself unable to do your daily PC work as you would normally do, in this situation.


  1. Create an empty folder in any NTFS drive(D, E ...) that has ample space.
  2. Run diskmgmt.msc from the Run command.

  3. Right click on the C: drive and select "Change Drive Letter and Paths" and click on "Add"

  4. In the window that appears, specify the path of the empty folder that we created in step 1.

  5. You can see that the folder that we created now appears as an exact copy of the C: drive and the that size of the C: drive have magically increased.