Depends if you are talking about size limit or lifespan. If it's size limit, you know better than anyone how many games you intend on buying. If you're going to buy enough games to fill a 3tb hard drive, money is not an object to you. At about 10gb per game, your hdd can hold 300 games. 300 x $50 = $15,000. If you're talking about lifespan, the average life of a platter hdd is about 6 years. You will want a second hard drive to backup the first because reinstalling all those games if it dies will be a huge pain.