How to use the old DVD drive after installing win7 system

How to use the old DVD drive after installing the win7 system

Some old DVD drives cannot be recognized in the Windows 7 system. Microsoft officially explained that it is due to the SATA driver (Msahci.sys) adaptive link power supply. The new power management features of Management (ALPM) have caused certain optical drive ALPM features to be enabled and disabled to function properly and cause the computer to fail to recognize the old DVD drive. The explanation is there, but the solution has not been released. In fact, try the following solutions, and maybe give you a big surprise.

Method 1: Open the Registry Editor and navigate to the [HKEY_LOCAL_MACHINE/SYSTEM/Current ControlSet/Control/Class/{4D36E965-E325-11CE-BFC1-08002BE10318}] item and directly click the item “Upperfilter”. And <;Loweverfilter” item deleted, restart the computer.

Description: This method may cause some programs to malfunction after deleting the two key values. For example, the CD burning program may not be usable. Usually, just reinstall the latest version of the program to solve the problem.

Method 2: Open a command prompt window with administrator privileges, enter the following command "bcdedit /set loadoptions DDISABLE_INTEGRITY_CHECKS" (without the outer quotes), after the execution is successful, you can solve.