Playstation 3 HD question.

From Support Centre's FAQ: Can I play FFXIV:ARR on the PS3 12GB model?

Can I play FFXIV:ARR on the PS3 12GB model?

The internal storage of the 12 GB model is insufficient to install FFXIV:ARR. If you wish to play the game on this PS3 model, you need to install an internal hard drive with at least 20GB of free space.

The game probably checks for it's "required" 20 gb, the 12gb would not be enough.