Disk Management - Shrink Volume
You can decrease the space used by primary partitions and logical drives by shrinking them into adjacent, contiguous space on the same disk. For example, if you discover that you need an additional partition but do not have additional disks, you can shrink the existing partition from the end of the volume to create new unallocated space that can then be used for a new partition.
When you shrink a partition, any ordinary files are automatically relocated on the disk to create the new unallocated space. There is no need to reformat the disk to shrink the partition.
Backup Operator or Administrator is the minimum membership required to complete the actions below.
Note: If the partition is a raw partition (that is, one without a file system) that contains data (such as a database file), shrinking the partition may destroy the data.