A missing CD DVD drive letter can – but must not – mean that there is a problem in Windows so that the drive is not recognized by the operating system. It can be by design as well at least in Windows 7 as empty CD DVD drives will not be listed under My Computer by default. The drives start to appear once a optical disc like a CD or DVD is inserted into them.
There are several reports and support requests in the search engines that describe problems with CD and DVD drive recognition in Windows 7 and other Microsoft operating systems. There is unfortunately not the one solution to fix all of the issues with CD DVD drives but a good start is Rizone’s CD-DVD Repair which is a portable software program that tries to fix missing or unrecognized CD and DVD drives in Windows 7 and other Microsoft operating systems.
The application comes with two additional options to reset the drive’s autorun settings and to protect the CD DVD drive against autorun parasites. A click on the Repair CD-DVD button will initiate the repair of the drives. It will also apply the two additional options if they have been selected by the user.
A restart of the computer system is required to complete the operation. Rizone’s CD-DVD Repair may not be able to repair all issues that are encountered by users. It is sometimes necessary to download new drivers or even update the firmware of the drive to make it compatible with Windows. A link to a website that is collecting firmware updates is given in the program interface as well.
It is usually a good idea to visit the manufacturer’s website first to see if there are driver or firmware updates for the CD DVD drive and apply those before running CD-DVD Repair.
CD-DVD Repair is a portable software program for the Windows operating system that can be downloaded by the developer’s website.
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Hi,
The most likely cause of optical drive “failures” in Windows are issues with Upper and Lower Filters caused by buggy or incompatible software.
This often shows up as a error code 19, 29 or 39 in the Windows Device Manager for the optical drive in question.
Rather than using a tool which does not explain what it’s doing how about debugging this yourself with a free tool which enumerates the Upper and Lower filters so you can see which might be faulty or missing?
Well such a tool exists at:
http://www.bustrace.com/downloads/free_utilities.htm
and is called devfilter.exe
Kind Regards
Simon
http://whatsmypass.com/filters.exe
made a quick one in asm to blow out upper and lower filters
or for a bat file you could do
REG DELETE HKLM\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318} /v UpperFilters
REG DELETE HKLM\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318} /v LowerFilters
or a reg file
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}]
“UpperFilters”=-
“LowerFilters”=-