The "delete volume" button on the win10 disk shows gray can not be deleted how to solve

The steps are as follows:
1, press “Win+R” key combination to open the run, enter: sysdm.cpl in the box, press the Enter key to open “ system properties & rdquo;;

2, switch to the [Advanced] tab, click on the "Performance" under the "Settings" button;

3, in the [Performance Options] interface to the "Advanced" tab, click on the virtual In memory, "Change" button;

4, select disk D, click the following "No paging file" and then click [Settings] & mdash; [OK], click OK in the properties interface, press Prompt to restart the computer, after the restart, you can delete the volume operation.