Windows 7 DVD drive can not use the solution

The general desktop or laptop will be equipped with a DVD drive, although the DVD drive is rarely used now, but sometimes it will be used, but if this time DVD drive What can I do if I can't use it?

Q: What can I do if the Windows 7 DVD drive cannot be used?

A: Windows7 does not recognize certain DVD drives. This is not a DVD issue, but 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 functions to be enabled and disabled to work properly and may cause the computer to be unrecognizable.

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

1. First check to see if Windows 7 does 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.

The specific symptoms may be as follows:

2, there are two solutions:

The first method: Modify 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 the above two values, you may lose some features, such as CD recorders. 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 & rdquo;, right click on the command prompt & rdquo; Run as administrator & rdquo; .

Paste the following command after the command prompt cursor and press Enter:

bcdedit /set loadoptions DDISABLE_INTEGRITY_CHECKS

Solved the problem that the DVD drive under Windows7 could not be recognized and could not be used.

This tutorial is for the new power management function of SATA driver (Msahci.sys) adaptive link power management (ALPM), which causes some optical drive ALPM function to be enabled and executed. Ways, if your CD-ROM is caused by other problems, then you have to use other methods.