It sounds like you are encountering a message from Autodata (likely the older CD/DVD versions like 3.38 or 3.45) saying "Place the CD/DVD in drive" or "Disk not found," even though the disc is already inside.
Solution: Restart your computer and disable Driver Signature Enforcement via the Advanced Boot Options (F8 during startup) to allow the emulator to function. Basic Troubleshooting Steps autodata place the cd dvd in drive verified
Action: Right-click the shortcut > Properties > Compatibility. It sounds like you are encountering a message
Disable Driver Signature Enforcement: On Windows 8 or 10, the emulator driver may be blocked. You must reboot and select "Disable Driver Signature Enforcement" from the advanced startup (F8) menu to allow the emulator to function. 3. Regional and Language Settings Disable Driver Signature Enforcement: On Windows 8 or
Most users today run Autodata using an ISO file (a digital copy of the disc) mounted to a virtual drive. If you see this error, Autodata is looking for the disc but the virtual drive is missing or the wrong drive letter is assigned.