Unless I'm mistaken, Windows only recognizes up to 2.5GB on a single drive? Assuming you've used 1TB, does your game take up 1TB? lol...
No offense, but don't try to give advice when you clearly don't know what you're talking about. You'll do more harm than good.
To clear some things up, the FAT16 filesystem had a limitation of 2GB per volume. FAT16 was officially replaced almost twenty years ago, by FAT32. FAT32 was in turn replaced by NTFS. For reference, FAT32 can handle drives of up to 16TB, depending on sector size. NTFS can handle 256TB.
Also, no game on the planet comes close to using 1TB of space. Such a game would require more than 200 DVDs to install, or 30+ Blu-rays, or five days of constant downloading maxing out a 20 megabit connection. It would also be much too large to install on the average hard drive, which is still less than 1TB for most people.
For reference, and so you don't say something so ridiculous in the future, most games are much less than 0.01TB, and the largest are less than 0.05TB.