Rockstar is saying that you should not install the second GTA V disc because it causes minor problems.
The game has hardly hit retail/e-tail shelves and it already has some bugs.
The game has finally and officially launched and the Xbox 360 version now has an official announcement in which Rockstar suggests not to install the second disc of the game because it may cause texture and pop-up problems.
Fortunately and thanks to Digital Foundry guys, there is a temporary solution and it involves installing the second disc on a 16GB USB storage flash drive.
Source:
www.gamesoul.it