I just have 2 types: DVD-RW and CD-R (except a manufactured movie DVD).
I tried the CDs and DVDs I had burnt before and I recently burned after realizing this problem.
It can write to both. But it doesn't read them (sees them as blank), doesn't matter if the discs is newly burnt or the ones that I burnt long ago.
There is no specific firmware on ASUS Site. This is what shows in the Device Manager:
hl-dt-st dvdram gt30n
I checked the driver
also with a driver update program (external software), no update has been shown.
I tried all the CDs and DVDs that I have, nearly 50, and none of them except one that has worked, which is still working. It is a burnt DVD to DVD-RW. I don't know why it is working and the others not. So, I tried around 20 DVD-RWs back to back, and around 20 CD-Rs back to back; no CD worked and only 1 DVD has worked.
Also, it doesn't read even if this CD-Rs and DVD-RWs have been written on another computer with another drive.
And as you know it reads the movie DVD (manufactured).