http://www.nintendolife.com/news/2015/04/xenoblade_chronicles_x_will_use_downloadable_data_packs_to_expedite_loading_times

• Basic Pack (2GB): for basic data, like the most frequent elements of terrain, which speeds up loading within the city and on Planet Mira. [Very Effective]
• Enemy Data Pack (2.7GB): for enemy data. Makes loading on the field even faster. [Mildly Effective]
• Player Data Pack (3.6GB): for player data (armor, etc.). Makes loading time faster when changing equipment in shops. [Mildly Effective]
• Doll Data Pack (1.7GB): for Doll data. Makes deployment of Dolls much faster. [Mildly Effective]

Makes sense, a ton of games now install on your HDD to speed up loading times. Kinda funny that these are optional tho, games on other systems would make them mandatory and call them a patch :P

That's not mandatory, right?

Pretty nice to have, but too bad it isn't already in the game disc...

It is quite big in size for a Nintendo type game

Doll Data Pack for sure. The others i will see how it goes.

Right.

I'll probably get the 1st one from the get-go, and see if I need any of the others later.

My 500gb is ready

Right... Or you can just download the whole game.

Atleast its not day-one dlc ^^