1. Use the system's Manage/Store/Disk Management tool to check the disk status. If other partitions are normal, only the capacity of disk C is problematic, and the next repair operation can be carried out;

2. Download the 32-bit disk tool DiskGenius4.7.2-X86.exe online, and open the window as follows;

3. Click Tools in the menu bar, and in the open drop-down menu, click Search for lost partitions, as shown below. The default search range is "whole hard disk", just click "Start Search";

4. Execute the "Start Search" task, and the following dialog box will pop up for the user to check and confirm. If the displayed partition capacity is the same as the original capacity, click the "Keep" button to restore the data recorded in the partition table. If the capacity displayed in this partition is incorrect, click the "Ignore" or "Stop Search" button to exit the window;

5. Re-operate again. If the partition searched for many times shows that the partition capacity is incorrect, it means that the data in the two record tables in the partition table are wrong and cannot be restored to the correct state with the backup record table. In this case, the problem can only be solved by deleting the partition and repartitioning it.