Right click the computer and select Manage. Disk Management deletes the partition on the right of disk C (backup files first). Right click Disk C to expand the partition. Enter the size of the number as required.
Win10 dividing steps
1. Right click "Computer" - "Management" on the desktop;
2. Left click Disk Management to open the disk management window;
3. Right click the primary partition to be compressed C - select Compress Volume;
4. Specify the allocated capacity in "Input compressed space" under "Total size before compression" and "Available compressed space size", and click "Compression";
5. Right click the "Unallocated" space obtained from the previous operation, select "New Simple Volume", open the "Welcome to the New Simple Volume Wizard" dialog box, and click "Next";
6. Enter the size of the partition you want to create in "Simple Volume Size" as required, and click "Next";
7. Assign the drive letter and path, write the disk symbol, and click Next;
8. To format a partition, click "Format this partition according to the following settings", "File System", select "NTFS", "Allocate unit size", select "Default", "Volume label", the default is "Add new volume", check "Execute quick format", and click "Next";
9. Click Finish to complete the partition.