public Operation detachDisk(String deviceName, OperationOption... options) {
    return compute.detachDisk(getInstanceId(), deviceName, options);
  }
public Operation detachDisk ( String deviceName , OperationOption ... options ) { return compute . detachDisk ( getInstanceId ( ) , deviceName , options ) ; }
Detaches a disk from this instance.

@return a zone operation if the detach request was issued correctly, {@code null} if the
instance was not found
@throws ComputeException upon failure