I have a Samsung SH-S182M and I've tried 2 different DL discs and have failed every time! I've only had luck with single-layer Verbatim DVD+R 8x (lightscribe).
Here's what I have tried:
Single Layer:
Verbatim DVD+R 8x (lightscribe) - WORKS
Dual Layer
HP DVD+R DL 2.4x (CMC MAG-D01-00) - FAILED
Verbatim DVD-R DL 2x-4x (MKM 01RD30) - FAILED
I started out with the HP discs first and, when it started failing, I updated the firmware. That didn't solve anything. I've checked a review (http://www.extrememhz.com/shs182m-p7.shtml) of that drive and it says that it only likes -R DL media. So, I searched online and bought the Verbatim DVD-R DL 2x-4x discs. They all fail. I usually don't even get an error about it. It usually just says that the burn was sucessful and then the media just appears blank (is there data on it?). Using verify shows that they failed.
If there are no good DL discs for that drive, then is there a drive that can actually write to a specific type of DL? I just want to be able to burn DL discs for clients and for backup purposes.
If I need to go with only single-layer discs, what's the fastest and most reliable media for my drive?