i don't know for this specific disk
another usefull way to display the disks :
From any view, left clic on torpedo officer and put your mouse up of the screen (3 disks available)
![](https://i36.servimg.com/u/f36/19/84/56/02/sh3im106.jpg)
...... torp officer
![](https://i36.servimg.com/u/f36/19/84/56/02/sh3im108.jpg)
......torp officer
![](https://i36.servimg.com/u/f36/19/84/56/02/sh3im105.jpg)
......torp officer
From any view, left clic on map officer and put your mouse up of the screen (1 black disk available)
![](https://i36.servimg.com/u/f36/19/84/56/02/sh3im107.jpg)
..map officer