According to some reports, the "Disc Read Error" on Call of Duty: Ghosts, including the "Homecoming" exclusive content, might be related to a known issue on Xbox 360 and Xbox One consoles. Specifically:
For consoles: Have a friend with a working copy complete "Homecoming" on their console, then move their save file via USB (using Horizon or Save Wizard) to your profile. According to some reports, the "Disc Read Error"