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What's DOS?
Posts: 1
Registered: ‎02-20-2012
Location: CA
Message 1 of 3 (1,555 Views)

DVD writer not seen in my computer. t420i,win 7, 64bit

DVD writer not seen in my computer
Device manager shows device but flag it as problem driver

Lenovo t420i, win 7, 64bit

when i do a system restore to earlier time when drive worked, it appears and after updates to machine (windows updates) it disappears again - can i not lock the driver when i get it to work?

Retired Partner
Posts: 955
Registered: ‎01-05-2010
Location: INDIA
Message 2 of 3 (1,528 Views)

Re: DVD writer not seen in my computer. t420i,win 7, 64bit

As I understand when the Windows update it corrupts the DVD writer driver.


If the DVD writer gets corrupted, kindly uninstall it from Device manager and the go to INF folder.

Click on Start button then go to Run dialog box and type INF


In this folder you will find a file Cdrom.inf (cdrom) delete this fie then restart the laptop and it will load a new fresh driver.


I hope this solution works for you.


Best Regards,


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Fanfold Paper
Posts: 1
Registered: ‎02-23-2012
Location: USA
Message 3 of 3 (1,519 Views)

Re: DVD writer not seen in my computer. t420i,win 7, 64bit

I had the same problem on my T510.   Drove me nuts, cuz Win7 said driver was "missing or corrupted" and whenever I chose "Update Driver" it replied that my driver was already up-to-date.   Argh!    I tried swapping the DVD device with a different model DVD reader, but the same problem remained.


Turns out the problem was NOT the driver itself, but with Windows registry keys that refer to UpperFilters and LowerFilters.

BTW, it had nothing to do with upgrading Windows, despite the title of this Microsoft article (URL below).   Instead, it was caused by iTunes inserting a hidden software "filter" between Win7 and its device driver.   A bad (eg, corrupted or missing) filter prevents Windows from talking to its device driver.   So removing a filter from the registry tells Windows to talk directly to the driver.


Using "regedit", I just followed these MicroSoft instructions to delete both the "UpperFilters" and "LowerFilters" registry keys, and suddenly everything WORKS!!!      Yay!


I did have to reinstall iTunes afterward, but this time iTunes inserted some working filters.

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