How to Add/Move Unallocated Space to C Drive in Windows 11/10 Read it and you can find a step-by-step guide about how to do the job. Have you ever encountered such a situation? Don’t worry! This page will talk about how to merge unallocated space to C drive to increase system partition space with a third-party Windows 11/10 partition magic tool. Merge unallocated space to system partition in Windows 11/10 is an easy and efficient solution when C drive is full problem happens. However, I have no idea how to merge unallocated space into C drive. So I want to shrink D drive to create some unallocated space, and then I can extend C drive with unallocated space. Now I find that the system drive is too small to perform well. The C drive is only 11/10 GB and D drive is 65 GB. I partitioned my laptop disk into two partitions, partition C, and partition D when I bought it two years ago. PAGE CONTENT: How to Add/Move Unallocated Space to C Drive in Windows 11/10 (Easy) How to Add Unallocated Space to C Drive with Disk Management Can I Move Unallocated Disk Space to C Drive in Windows 11/10