DISKPART> list disk

  Disk ###  Status         Size     Free     Dyn  Gpt
  --------  -------------  -------  -------  ---  ---
* Disk 0    Online          931 GB  1041 MB        *
  Disk 1    Online          232 GB      0 B        *

DISKPART> delete disk override

The disk you specified cannot be deleted.
Please select an empty missing disk to delete.

DISKPART> list disk

  Disk ###  Status         Size     Free     Dyn  Gpt
  --------  -------------  -------  -------  ---  ---
* Disk 0    Online          931 GB  1041 MB        *
  Disk 1    Online          232 GB      0 B        *

DISKPART> clean

Virtual Disk Service error:
Clean is not allowed on the disk containing the current boot,
system, pagefile, crashdump or hibernation volume.