Troubleshoot some DVD optical drives that are not recognized by Windows 7

Is that the DVD drive is not recognized by the system, in Device Manager is just a ... The exclamation point indicates a problem with the data signature: I don't know if you've had a very strange problem after you upgraded to Windows 7.

"Windows cannot verify the data signature for this device ... Middle slightly (Code52) "

One way to do this is to turn off digital signatures. This will drive the drive to work correctly.

On the other hand, it's not a perfect solution. To troubleshoot problems with DVD optical drives that are not recognized by Windows 7, refer to the following methods.

Optional method One:

1. In the Start menu, enter regedit, carriage return. Open Registry Editor

2. Expand the following registry key

HKEY_LOCAL_MACHINE\SYSTEM\CURRENT\CONTROLSET\CONTROLCLASS{4D36E965-E325-11CE-BFC1-08002BE10318}

3. On the right side of the panel, right click on upperfilters, click Delete

4. Click "Yes" to confirm the value deletion

5. Also delete the LowerFilters value. Confirm Delete

6. Quit Registry Editor and reboot

Note: When you delete the top two values, you may lose some functionality, such as a CD recorder. You must reinstall the affected program. If the problem persists, you may need to contact the program vendor for an updated version of the program. In addition, for CD drives that cannot read CD discs, you need to detect the CD drive or CD.

Optional method Two:

1. Click Start-> All Programs-> Accessories

2. Right-click the command prompt-> "Run as Administrator"

3. Paste the following command and enter: Bcdedit/set loadoptions ddisable_integrity_checks