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How to Make C Drive Bigger in Windows 7/10

Updated on Jan 19, 2018 by Daisy to Partition Master

Your Windows 7/10 system drive, c drive is full and runs out of space? Take it easy. Here you can learn how to make c drive bigger by sparing some disk storage from other drives to it.

"Can I spare some disk storage from D to C drive partition so as to make C drive bigger? My laptop used to run Windows 7, and lately, I upgraded Windows 7 to Windows 10. Everything is fine with the new operating system except that the system drive becomes stuffed. However, a considerate amount of space is available to use in other partitions. I'm thinking to allocate the unused space to C. Is it possible to do that?"

When upgraded your previous Windows to Windows 10, it's common to see that C drive (your system partition) runs out of space, because system data, files, and folders from the old Windows OS and the new are all concluded in the drive, making Windows 10 rollback in one month possible.

Once C drive is full, your computer performance starts lagging behind. In such a case, each time it takes a little longer to boot up the machine, launch and run a program, play a game, etc. To fix the "insufficient C drive space" issue, it's better to do a reallocation of space of the hard drive instead of replacing the drive by a larger one.

Typical Ways to Enlarge C Drive Partition by Taking Space from Others

Here are two typical free solutions people usually take to increase C drive space. On both Windows 7 and Windows 10 computer, you can use a program called Disk Management, where you can access by right-clicking "Computer" and then go to "Manage". On the left side of the opened window, you can find "Disk Management" under "Storage".

But most of the time, the extend volume option is greyed out in Disk Management if there's no unallocated space (i.e. with no drive letter and file system) available on the drive. For average users, it's hardly possible to make C drive bigger here.

extend volume is greyed out

To simplify the system partition resizing process, you can use a third-party free partition manager. EaseUS Partition Master Free is the highly recommended one. Just download and install the hard disk management utility on your Windows 7 or Windows 10 computer, you can freely create more space for the C drive in short of disk capacity.

How to Use EaseUS Partition Master Free to Increase C Drive Space?

Step 1. Launch EaseUS Partition Master.

Note that if there is no unallocated space after the system C partition, please follow the guide step by step. If there is unallocated space on hard disk, just drag the space showing in white next to the C drive, and please directly go to step 5.

Step 2. Right-click D: and select "Resize/Move partition".

Step 3. Position the mouse pointer on the left partition handle to shrink D: drive.

shrink D drive to make C drive bigger

Step 4. Click OK. Then there is unallocated space on the right side of C: drive.

Step 5. Repeat step 2 and 3. Position the mouse pointer on the right handle of C: drive to extend it.

make c drive bigger

Step 6. Click Apply.