UDATASEG         Define uninitialized data segment                  Directive

  UDATASEG                              ; Ideal or MASM mode
  .DATA?                                ; MASM mode

    Defines the start of the uninitialized data segment in a module. You
    must first have used the MODEL directive to specify a memory model.

    Be careful to include only uninitialized data in this segment or the
    resulting executable program will be larger than necessary (WARN UNI).