IOCTL_DISK_IS_CLUSTERED control code
Allows a driver or application to determine if a disk is clustered.
The buffer at Irp->AssociatedIrp.SystemBuffer contains a Boolean value, with TRUE indicating that the disk is clustered.
The Status field is set to STATUS_SUCCESS, or possibly to STATUS_BUFFER_TOO_SMALL, STATUS_INVALID_PARAMETER, or STATUS_UNSUCCESSFUL.
Build date: 11/16/2013