Win7 DVD drive can not be used solution

                  Windows 7 does not recognize certain DVD drives. This is not a DVD issue, but a Windows 7 issue. Microsoft officials have explained that this problem is due to the new power management features of the SATA driver (Msahci.sys) Adaptive Link Power Management (ALPM), which causes some CD-ROM ALPM features to be enabled and disabled to work properly and may cause the computer to be unrecognizable.

If your DVD drive just fall into this category, then a closer look at the following solution to it!

1, we must first look at whether it is due Windows7 not recognize your DVD device. Just in the device manager is just a yellow exclamation mark showing a problem with the data signature, or the prompt "Windows can't verify the data signature of this device..." and so on. Specific symptoms may

below:

2, solutions, there are two: The first method

: modifying the registry

Start->Run-> regedit -> Open the Registry Editor and expand:

HKEY_LOCAL_MACHINE/SYSTEM/Current ControlSet/Control/Class/{4D36E965-E325-11CE-BFC1- 08002BE10318}

Delete the Upperfilter and Loweverfilter items in the right frame and restart the computer.

Note: When you delete two values ​​above the price is likely to lose some features, such as CD recording program. If this happens, you must reinstall the affected program. If the problem persists, you may need to contact the program vendor to see if there is an updated version of this program.

The second method: command line method

Click "Start -> All Programs -> Attachments", right-click on the command prompt "Run as administrator".


at the command prompt cursor paste the following command and press Enter:

bcdedit /set loadoptions DDISABLE_INTEGRITY_CHECKS

this would resolve the case Windows7 DVD drive can not recognize and Unable to use the question.