How am I playing on the installation disc?

I own an Xbox one and I just bought Saints Row IV (for the Xbox 360). Since its backwards compatible for the Xbox one, I popped in the installation disc, expecting that when the download was done I would take that disc out and put in the actual game disc, but somehow, I’m able to play the game by just using the installation disc. I’m confused here—-is the actual game disc different than the installation disc if I’m somehow able to play on the installation disc??
Best Answer
For backward compatible games you installed using a disc, the disc is only used to verify yoru ownership of the game (DRM). All game content was provided and installed by the download. Hence, the installation disc suffices to verify the ownership and play the game from your back-compat catalogue.
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How do I run a installation disc?
If installation doesn't start automatically, browse the disc to find the program setup file, usually called Setup.exe or Install.exe. Open the file to start installation. Insert the disc into your PC, and then follow the instructions on your screen. You might be asked for an admin password.Why do I have to install a game if I have the disc?
Why do I have to install a game if I have the disc? Optical disc drives can't read data quickly enough to keep up with modern games, so you get the best gaming experience when you install the game from a disc on your Xbox console.How do I play an installed game on Xbox One?
Digital gamesUse the Other Installation Disc That Says 64 bits [ Error Fixed..!! ]
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Images: Yan Krukov, RODNAE Productions, Katya Wolf, Yan Krukov