Reinstalling the system to the system disk C will format your disk C, which will restore your disk C to its original space, which is equivalent to "slimming". If you want to increase your C drive space, you need to "expand" your C drive. You can choose to move some space from other disk partitions to increase your C disk space.

C disk expansion method:

1. The first thing you need to know is that other disks that need free space to expand drive C are on the same hard disk as drive C, otherwise the expansion cannot be realized. Right-click the Start menu in the lower left corner and select Open Disk Management.

2. In disk management, right-click the disk to the right of disk C, here is disk F. ..

3. Click Delete Volume in the pop-up menu.

4. Right-click the disk again and select Delete Partition.

5. Right-click drive C, select the extended volume, and then follow the wizard step by step.