First, use the disk cleaning tool to delete temporary files and old version updates, then manually clear the cache in the %temp% and C:\Windows\Temp directory. Then execute powercfg -h off to close hibernation and release hiberfil.sys space through the administrator command prompt, and then migrate the virtual memory paging file to other disks. Finally, by compressing adjacent partitions and expanding the capacity of the C disk or using third-party tools to complete the capacity expansion operation.

If you find that the Windows 10 system's C disk space is about to run out, the system runs slowly or the disk space is frequently popped up warnings, it may be due to system update residues, temporary file accumulation, or software cache occupancy. The following are a variety of effective cleaning and expansion methods.

This article runs: Dell XPS 13, Windows 10

1. Use the system's own disk cleaning tool

Windows 10's built-in disk cleaning feature can safely delete temporary files, system caches, and legacy Windows update files, freeing up GB of space without installing third-party software.

1. Enter "Disk Cleanup" in the taskbar search box, and then click to open the app.

2. In the drive selection window, select "C:", and then click "OK".

3. After waiting for the system to scan, check "Temporary File", "Recycle Bin", "Windows Update Cleanup" and previous Windows installations in the file type list (this item can free up 10-20GB of space).

4. Click the "Clean System File" button to get more cleanable items and repeat the above checking steps.

5. After confirming that it is correct, click "OK" and select "Delete File" to complete the cleaning.

2. Manually clear temporary and cached files

Some applications and system processes generate large amounts of temporary data in specific directories. These files will not be completely cleaned by regular disk cleaning and require deep cleaning through manual path access.

1. Press Win R key to open the "Run" window, enter %temp% and press Enter to enter the temporary folder of the current user.

2. Press Ctrl A to select all files and folders, and right-click to select "Delete".

3. If the prompt "File is in use", please skip items that cannot be deleted, and the rest can be deleted normally.

4. Open the "Run" window again, enter C:\Windows\Temp and press Enter, and repeat the selection and delete all.

3. Turn off the hibernation function to delete the hibernation file

Windows 10 enables hibernation by default, which will generate a large file called hiberfil.sys, which is usually equal to the physical memory capacity. If you do not use Hibernation, you can disable it via the command line to free up a large amount of space.

1. Press the Win R key and enter "cmd".

2. Press Ctrl Shift Enter to run the command prompt as an administrator.

3. Enter the following command in the command line and press Enter: powercfg -h off .

4. After the command is executed successfully, the system will automatically delete the hiberfil.sys file in the root directory of the C drive.

4. Migrate virtual memory to other disks

The virtual memory paging file (pagefile.sys) is located on disk C by default and can reach 1.5 times the size of memory. Moving it to another partition can effectively reduce the burden on disk C.

1. Right-click "This Computer" and select "Properties".

2. Enter "Advanced System Settings" and click "Settings" in the "Performance" area.

3. Switch to the "Advanced" tab and click the "Change" button (located in the virtual memory area).

4. Uncheck "Automatically manage paging file sizes for all drives", select C drive, set to "No paging file", and click "Settings".

5. Select the target disk (such as D disk), check "Size of System Management", click "Settings" and confirm the changes.

5. Use professional tools to expand the C disk partition

When the physical space of the C disk is insufficient, the capacity of the C disk can be expanded by adjusting the adjacent partitions. This operation requires unallocated space and it is recommended to back up important data in advance in case of accidents.

1. Right-click the adjacent partition (such as D disk) on the right side of the C disk and select "Compress Volume" to free up some unallocated space.

2. After the compression is completed, right-click on the C drive and select "Extended Volume".

3. Follow the prompts of the wizard and enter the size you want to increase on the "Select Space" page.

4. After completing the wizard, the capacity of the C disk will contain the newly merged unallocated space.

5. If the system's own functions are not available, you can use third-party tools such as Yiwo Partition Master to achieve cross-partition expansion.

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