I have a DVD-writer toshiba sd-r6112 on my laptop. Recently it cannot recognise empty DVD-RW so I cannot burn DVDs anymore. What can i do? I can’t find Toshiba sd-r6112 firmware or any update.
Need help 
What specific firmware is on your drive?
Format the DVD-RW using DVDInfoPro, Nero would be buggy…
I have no idea 
How can I see wich one is it? :o
Thanks a lot
By using a proper buning app or tools like Nero CD DVD Speed, DVDInfoPro, etc.
The firmware is 1031
1031 is the latest for your drive already.
Test the drive in another computer, maybe by using an adapter, or install the OS freshly.