1. Quickly open Disk Management with diskmgmt.msc
2. Because I don't want to add a hard disk, I first compress it on the C drive and then add it, click to select the drive letter and right-click to compress, enter how much space is needed, and then click Compress to confirm
3. Then we will have an extra piece of hard disk space with 1GB. You can click the C drive to add to increase the space, or you can create a new drive letter.