It’s okay to laugh. While the second disc is necessary to complete installation, affected players can enter the serial number on the box into Steam’s product activation window to activate the game. But they’ll have to wait umpteen hours for the download to finish and do their best to avoid eye contact with their Friends list in the meantime.
As for Activision and EA? I imagine both will be making noisy phone calls to a shared manufacturing plant this afternoon. We've reached out to Activision for comment.
Have you been landed with a useless Mass Effect 2 install disc? Let us know in the comments.