In such cases, adding unallocated space into that partition can help extend the capacity and solve the low disk space issue. Most users will experience this issue soon or later. This could lead to a ' low disk space' warning on your system partition and makes computer slow down. Over time a number of files will build up on your system that will eventually use up a large amount of space. However, the majority of users want to add unallocated space to another partition in Windows 10.
To take full advantage of all your storage space, computer users can either add unallocated space to a partition in Windows 10, or create a new partition with the unallocated space. This type of space can be used to store deleted files, but when Operating System saves another file in the same place, the previous data will be overwritten.
Unallocated space is the disk space that doesn’t belong to any partition and no programs or data are allowed to write to it. Why Need to Add Unallocated Space in Windows 10 Partition?