How do you get the data cluster in mass effect 3?

In Mass Effect 3, you can acquire the data cluster by exploring the "Rannoch" mission, specifically during the quest involving the Quarian and Geth conflict. As you progress through the mission, look for a terminal that allows you to access the data cluster. Interacting with it will provide you with important information that contributes to the war effort and can influence the outcome of the game's ending. Be sure to complete the mission objectives to ensure you can access it.