hard-drive
The Xbox 360 has an advantage over all other systems: Multiple accounts. If you want to start another campaign, simply create a new account on your Xbox, then put in Halo 3 and play. It will save data to that account, and allow you to have multiple campaign save files.
It will do it automaticly.
Halo doesn't use 'save games' it uses checkpoints, just select Campaign and it will return you to where you left off. Or you can replay a level.
The PlayStation 3 keeps telling you that there is no save data on the USB because the USB is empty.
If you collect them all in order in one campaign play through (as in on one save, doesn't have to be all at once) you will get an achievement called marathon man
It has a auto save
Only if you delete your original data first. If you want to keep your original file, you can make a backup file on your desktop.
You can't. Pokémon games only keep one save file. Happy adventuring all over again! But if you haven't saved the game yet, you're in luck so just reset the console and your save is back!
You can use a tape recorder to record a conversation on Halo 3.
Go to theatre. Find the film you want to save and hit save.
To get an avatar award you need to complete a level of the campaign on legendary but start it on normal and die as much as you want then at the end of the mission save and quit then carry on from where you left off but on legendary and you get the award :)
the only way i know is to delete the entire game save file which will also remove your multiplayer forge and spartan ops progress. its in system settings somewhere to do with game saves