LiteOn DVD 811S Read/Write problems

My friend asked me if i could do a favor for him and post his problems here.
Here is the text:

have problems with reading the contents of a DVD media on my DVD LDW-811S.
Almost 80% of DVD-R medias are not readable at all… the disc just spins and reports no disc…
…the same goes when trying to burn … some of the high quality DVD Media are not recognizable at all …
i have the latest firmware…any ideas??

@ Dim
Follow #6 in Please read before posting in this forum! :iagree:

i’m gonna let him do that instead.