can't delete hard disk

Hello
I can't delete hard disk
I have tried two options with no success

Option 1: using the Windows interface:
I did: Computer Management (Local) > Storage > Disk Management, Right-click the dynamic volume you want to delete, and then click Delete Volume
the problem: the "delete volume" is not active

Option 2: using a command line:
I did: in the DISKPART prompt -->, type:list volume, type: select volume n, At the DISKPART prompt, type: delete volume
the problem: "Virtual Disk Service...

can't delete hard disk