Why did you change the win7 system? DVD optical Drive not available

The computer was originally XP system later replaced by the Win7 system, found that DVD optical drive can not be used, the system has not moved anything, the other computer has changed this system, but DVD optical drive can be used. Is it because the computer is new and the configuration is better? This is a friend asked me the question, the answer is indeed because the other computer configuration is better, Win7 support its DVD drive.

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Of course, the problem can be solved, first of all explain why not?

Win7 does not recognize your DVD, as Microsoft has explained, because of the new power management features of the SATA driver (msahci.sys) Adaptive Link Power Management (ALPM), some CD-ROM ALPM features are not working properly, and causes the computer to be unrecognized.

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Win7 does not recognize the symptoms of the DVD drive

Select Properties by right-clicking on the computer-hardware-is Device Manager and check inside to see if the DVD has a yellow exclamation point. The following figure:

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Workaround One:

Click Start-Run, enter Regedit into Registry Editor, and then navigate to: Hkey_local_machine/system/current controlset/control/class/{ 4d36e965-e325-11ce-bfc1-08002be10318} Delete upperfilter items and loweverfilter items in the right box, note that you need to reboot to take effect, and deleting these two items will cause your optical drive to lose part of its functionality, But it's a lot better than not being able to use it.

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Workaround Two:

In the operation of the input cmd, remember to run as an administrator, and then pop-up window input: Bcdedit/set loadoptions ddisable_integrity_checks. Restarting can also solve the problem that your computer does not recognize the DVD drive.

The above is about why the Win7 system DVD drive is not available . Can not blame your optical drive is not the way, just good is win7 not support, if the computer bought for a long time or change it.