However, the unallocated space you add to the C drive must be adjacent and behind the C drive. So some people may use Disk Management to shrink D drive to get an unallocated space and extend C drive with it. C drive full and D drive totally empty-What to do? Otherwise, your C drive will be getting full quickly, and your system will run slowly. C drive is where the operating system installed, so generally, C drive needs to be allocated with enough space and we should not install other third-party programs in it. How can I extend my C drive?”Ĭ drive is easier to get full for different reasons, such as unreasonable partition size allocation, installing too many programs. But when I try to extend C drive with it, the option Extend Volume greyed out.
Thus, I shrink D drive to get an unallocated space. There is not enough space in my C drive to download new programs.