Windows 7 system cannot verify device

Because Windows 7 system is not compatible with some DVD drives, it is not recognized.

For example, the user right-clicks the "Computer" icon on the Windows 7 system desktop, selects the "Properties" option in the shortcut menu that pops up, and clicks "Device Management" on the left in the "System" Properties window that pops up. "" button, in the "Device Manager" dialog box that opens, if you see no DVD project inside, but a yellow exclamation mark, there is a problem with the data signature or the prompt "Windows can not verify the data signature of this device.... ..", etc. This means that the DVD drive cannot be recognized.

According to the micro saddle, this is because the new power management function of the SATA driver (Msahci.sys) adaptive link power management (ALPM) has caused the ALPM function of some DVD drives not to be enabled and executed properly. So the resulting

Windows 7 system does not recognize and use the drive.

Microsoft has not yet released a patch to solve this problem. Users are advised to use the "bcdedit" command to solve such problems by clicking "All Programs" in the "Start" menu on Windows 7 system. - "Attachment" command, right-click the "Command Prompt" option in the "Accessories" submenu, select the "Run as administrator" option in the pop-up shortcut menu, and then pop up the Command Prompt window, enter " Press the enter key after the bcdediC' command.