By the way, Windows 7 requires more than 16 GB of available space, if you want to install dual OS. How to Partition C drive in Windows 10 without Formatting. Then you will see the first window below. Move the slider bar or enter an exact value into the "Partition New Size" box to extend the C drive. Therefore, after installation, it will be difficult to take memory from other drives (for example D or E drive) and marge it to C drive. Partitions help enable users to divide a computer hard drive into different drives or different portions for a number of reasons. Now you should get a comprehensive understanding of how to extend C drive in Windows 10 without formatting or deleting partitions. In this article, you will learn how to increase and extend C Drive in Windows 10 without formatting. Then, right-click C drive and select “ Shrink Volume ”, you can type in the amount of space you want to shrink the disk by (the second window). Now, you know you can still use this method if you’re searching for How to partition a Hard drive in Windows 8 or How to Partition Hard disk in Windows 7.. And some people also search, How to partition 1TB Hard disk in Windows. Here the complete information How to partition c drive in windows 10 without formatting or without any data loss. And click "Proceed" > "Yes" to start. Final Words. To those Let me tell you to drive size 1TB, 2TB or 500MB doesn’t change the steps of the … As you know that sometime, you may forget to give C drive more space at the time of partition. Preview and confirm these operations. Disk partition or partition is a section of the hard drive that is separated from other segments. 5.