1. Right-click on the Windows Start Menu and open “Disk Management”.
![](https://static.wixstatic.com/media/a27d24_149f08cfb9bc4a46855a073f07945e67~mv2.jpg/v1/fill/w_245,h_335,al_c,q_80,enc_auto/a27d24_149f08cfb9bc4a46855a073f07945e67~mv2.jpg)
2. I am assuming that you have made a back up of all your files from D Drive. Now, right-click on D Drive and click on “Delete Volume”. It will format the partition and make it an unallocated partition.
![](https://static.wixstatic.com/media/a5f8de_1d762d3227bb4a7480e6582135c44720~mv2.jpg/v1/fill/w_640,h_449,al_c,q_80,enc_auto/a5f8de_1d762d3227bb4a7480e6582135c44720~mv2.jpg)
3. Next, right-click on the C drive partition and select “Extend Volume”.
![](https://static.wixstatic.com/media/a5f8de_00c85e5d8bf94c7180da7afe91e82cbc~mv2.png/v1/fill/w_628,h_474,al_c,q_85,enc_auto/a5f8de_00c85e5d8bf94c7180da7afe91e82cbc~mv2.png)
4. A pop-up window will open up. Keep clicking on “Next” and finally click on “Finish”.
![](https://static.wixstatic.com/media/a5f8de_fb60484d0f66419d9fef5ada83f0d34c~mv2.png/v1/fill/w_616,h_497,al_c,q_85,enc_auto/a5f8de_fb60484d0f66419d9fef5ada83f0d34c~mv2.png)
5. Finally, your C Drive will be merged and storage space will be increased instantly. So this is how you can extend C drive space on Windows 10.
![](https://static.wixstatic.com/media/a5f8de_a7b3e198995c49afae34d3c17d9fd5fa~mv2.jpg/v1/fill/w_640,h_183,al_c,q_80,enc_auto/a5f8de_a7b3e198995c49afae34d3c17d9fd5fa~mv2.jpg)
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