If you see the error message "No disc in drive" when trying to play a Disney Steam game, you are likely using a computer that does not have a CD/DVD-ROM drive.
While you don’t actually need the disc to play the game, the game has been ported from the CD/DVD-ROM version and includes a "disc check" software. To fix this, try installing a Virtual CD-ROM drive, which you can find here.
Once you’ve installed the software, please run a "Windows Update" and install all available updates to ensure your computer is up-to-date.
You should now be able to run the game without an error message.
Please note that this fix only works for Windows XP/Vista/7; it is not applicable to Windows 8.