There is only one way, that is, repartition of the hard disk, because drive C is a system disk. You can only expand the capacity of a partition by deleting it and then reassigning the format. If it is a disk other than the system disk, you can redistribute the partition size without having to do the system again. You can delete the partitions of disk C and disk D and then redistribute the size of disk C, and the rest will automatically become disk D. Only in this way can you achieve the minimum guarantee.