Here is a collection of videos made by Nak3deli on how to find all the terminals in Halo 4, so if your just lacking that one terminal these videos should help. All the videos show you how to find the terminals and show the videos as well
Halo 4 Terminals – Chief’s Record & Prologue Video
Halo 4 Terminals – Requiem Terminal 1 Location & Video
Halo 4 Terminals – Forerunner Terminal 2 Location + Video
Halo 4 Terminals – Infinity Terminal 3 Location + Video
Halo 4 Terminals – Reclaimer Terminal 4 Location + Video
Halo 4 Terminals – Shutdown Terminal 5 Location + Video
Halo 4 Terminals – Composer Terminal 6 Location + Video
Halo 4 Terminals – Midnight Terminal 7 Location + Video
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