Solutions for DVD optical Drive Win7 system

Windows7 does not recognize some DVD optical drives, this is not a DVD issue, but a Windows7 problem. Microsoft officials have explained that the problem is due to the new power management capabilities of the SATA driver (msahci.sys) Adaptive Link Power Management (ALPM), which causes some optical drive ALPM features to be enabled and performed that do not work correctly and may cause the computer to be unrecognized.

If your DVD drive happens to belong to this category, take a closer look at the solution below!

1, first of all to see if it is because Windows7 can not identify your DVD device. Just a yellow exclamation point in Device Manager. There is a problem with the data signature, or you are prompted that "Windows cannot verify the data signature of this device ..." and so on.

The specific symptoms may be the following figure:

2, the solution, there are two kinds:

The first method: Modify the Registry

Start-> run-> regedit-> Open Registry Editor, expand in sequence:

Hkey_local_machine/system/current controlset/control/class/{4d36e965-e325-11ce-bfc1-08002be10318}

Remove the UpperFilter and Loweverfilter entries in the right box and restart the computer.

Note: When you delete the top two values, you may lose some functionality, such as a CD recorder. If this happens, the affected program must be reinstalled. If the problem persists, you may need to contact the program vendor for an updated version of the program.

The second method: command line method

Click "Start-> All Programs-> attachments" and right-click the command prompt "run as administrator".

Paste the following command after the command prompt cursor and enter:

Bcdedit/set loadoptions Ddisable_integrity_checks

This solves the problem that the Windows7 DVD optical drive is not recognized and cannot be used.

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