There are three found on the first level called the Ark. Find the first immediately upon entering. There'll be a door to the left, which is entered to find the first of the terminals. To find the second terminal look for the structure that enables tanks across the bride of light. The terminal can be found directly behind the bridge controls. The last terminal on level one is a challenge to locate. Following a battle with a scarab there is a large structure, followed by a door and a staircase - look under the staircase.
Then there are three on the Covenant. The first of these terminals, overall terminal four, is accessed via the elevator leading to the tower controls. Reach the terminal by jumping from the elevator to an adjacent platform. The fifth terminal can be reached by using a hornet, heading towards the second tower. If you're going the right way you'll hear a voice saying the tower is clear. The terminal is inside the tower. Tower three holds the sixth terminal on a platform.
There are 2 left. Terminal 7 is found at the beginning of the final level in Halo 3. To find it, simply head forward from the start of the level, until you encounter the area with a few structural beams going from one wall into another. At this point, turn right, and look for beam separate from the rest, Follow this beam into a doorway. Cortana will ask you, "Where are you going?". Turn left once inside, and the Terminal should be there. The last can be found on the level Cortana, and is located on the basement floor of the room with the Tilt Skull in it. At the very bottom of this room, there is a Gravity Hammer leaning against a stand. This stand is a Terminal, it does not look like the other terminals in the game, it looks like a pedestal of light.
Upon accessing it, Cortana will take over your HUD with a brief message
OK I could explain where all the terminals are or I could just give you a link to a website that will explain everything. I'll go with the link. Here you go: http://www.gamefaqs.com/console/xbox360/code/926632.HTML
(PS- just scroll down to you get to terminal locations)
Or heres a YouTube link if that's better for you http://au.youtube.com/watch?v=RczXMp7RXko
there are no terminals in halo reach did you mean halo 3 or anniversary
there isn't any
The Seventh Column. Bungie has a thing for sevens.
Random journal entrys from the forerunners
Not much, except they provide you really cool information, and if you find them all you will get an achievement.
You go to it and hold the X button
download the map pack
when you activate them all you get the achievement called Marathon Man. It should unlock the armor called Security Shoulders
3 each on the ark and on the covenant...1 in halo...to get credit, press a as many times as you can, wait for it to lock up, and keep waiting...then when 2nd message comes up press a to end of that, then exit with b.
There are seven. For help on how to find them, go to the following link: http://www.gamefaqs.com/console/xbox360/code/926632.html
The terminals are for an achievement, Marathon Man (40G), and also for backstory and information of the game. They look like a silo and when you get near it you see some sort of giant eye. The Arbiter cannot view it if you are playing co-op.
get all terminals collected ( the big shiny silver things which open when near). if you want help my gamertags cosmeticbobbob.