Team Bondi founder Brendan McNamara told Official Xbox Magazine that it took "miraculous compression" to fit the game on to three discs.
"We've always been called stupidly ambitious," he said. "Along with Rockstar we make very big games.
"It took a lot of effort to get down to three discs - I think we were on four or five or six at one point - and to get it on to one Blu-ray [on PlayStation 3]. We're pretty pleased that we got it down to that in the end."
He added: "It's the biggest map that we've done and that Rockstar have done, so there's a lot of detail in there, and also a lot of actor's performances - 21 hours worth."
Last week, Rockstar Games revealed that PlayStation 3 was the lead platform during development.
L.A. Noire is available in North America today and on Friday across Europe.
> Read our Xbox 360 review of L.A. Noire
Watch the launch trailer for L.A. Noire below: