Perhaps those who are interested in pursuing video game creation and programming will offer a reasonable explanation.
According to a poster in the NeoGAF forums , the file sizes for Final Fantasy XIII-2 are significantly smaller than FFXIII, and this goes for both the PlayStation 3 and Xbox 360 versions of the game.
Apparently, FFXIII-2 comes in at 14.446 GB on the PS3 and 7.8 GB on the 360; in direct comparison, FFXIII weighed in at a whopping 37.6 GB on the PS3 (on a dual-layered Blu-Ray disc), and the game was 18.3 GB in size on the 360 (with three DVDs needed). So, it seems Square Enix got better at…something. We're not designers so we don't have an explanation, although we imagine it's probably simple; we'll let the more technically minded community members at PSXE explain the drastic difference.
And don't think the game is smaller for some reason; the game will last 40 hours and supposedly contains enough content to push that play time over 100 hours. No, this is all about compression and stuff like that…and I'm clueless. 😉 By the way, FFXIII-2 launches today in Japan.
Related Game(s): Final Fantasy XIII-2