the only way is to have a lot of memory cards and make sure they have about 6gigs for each map
no, you must connect to xbox live to download halo 3 map packs.
Go re-download it
You can download Anniversary Maps to Halo: Reach but not to Anniversary.
go to Marketplace, Game add ons, map packs, browse 'halo'
no
You can download Halo Zero from http://games2bee.webs.com/apps/blog/.....
No, I play halo reach on my 4gb xbox.
get your hardrive at your nearest gamestop.
I would ask of you to be more specific, but since its not possible to change your answer, I'll say both. To get Forge maps, make an account at http://www.bungie.net/ (I did not need to copy and paste :-P) and download directly to your XBox360, then start a local game and it should say Download Complete. To get map packs, go to the market place, look for the tab that says "Map Packs" and find the Halo 3 Map Pack you want, then it should download, and then you'll have the maps in Halo 3.
At the Bungie halo website or Cnet and search halo on download ssection
You have to have Xbox live, and you download the maps.
no, you have to download the rest