The distribution of free space is out of balance now. It is a common problem that as time goes by, the Windows C drive runs out of space gradually! While, the other partitions, like D drive, still have much free space. Is there any way that I can increase C drive space from D drive, other than a fresh OS installation.” Need to extend C drive space from D drive? Now I always receive the low disk space warning on C drive. No matter how I try to get apps or programs loaded into D drive, everything goes to C drive and makes it almost full. “I have a desktop that comes with a small C drive and a large (and mostly empty) D drive. “Can I increase C drive by taking space from D drive?”