Win7 CD-ROM is gone, what to do

1. In most cases, the CD-ROM drive of our computer is gone, it may be caused by the improper installation of the driver. We usually see the CD-ROM device in the device manager, but there will be An exclamation point, at this time we just need to download and install the corresponding CD-ROM drive to solve.
Second, for the friend recently encountered, in the device management can not find the optical drive device, usually only two possibilities:
1, the optical drive is broken or the internal optical drive line is loose;
for this In this case, the author's friend can be excluded here, so the CD-ROM drive is good on the XP system. You can't change the Win7 system CD-ROM drive. It can be used before, indicating that the internal connection is no problem.
2, Win7 opened ahci, CD-ROM drive is not compatible with ahci
>>.AHCI What is AHCI mode?
This situation should be encountered by the author's friend, by modifying the registry After that, it was solved. Here is a detailed introduction with everyone.
First use the combination shortcut Win + R to open the start dialog, then open the type: regedit command, click the OK button to open the registry editor.

Open Registry Editor Method
After entering the Registry Editor, expand:
HKEY_LOCAL_MACHINE--SYSTEM--CurrentControlSet--Control--Class--{4D36E965-E325-11CE- BFC1-08002BE10318}, as shown below:

As shown above, click on the registry value of {4D36E965-E325-11CE-BFC1-08002BE10318}, we find UpperFilters, LowerFilters in the right value of the right , delete it, as shown below:

Win7 CD-ROM is missing the solution
After the above steps are completed, we close the registry editor, then restart the computer, restart the computer, Usually you can see the optical drive device when you enter the device manager.