Related Reading bolow: Windows 10 can't extend volume in Disk management Of courese, there are many disk maps you might run into in the future, they are mainly show as follow: That's all the steps on how to extend system partition
Then, the popup window will show how to do it, max extension, manually distribute disk space to extend are both available for you to choose, after it, OK to commit. Let's select C drive, or the system partition, then Next to extend
