Sorry for bumping an ancient thread - but I wanted to stay on topic.
An old Lenovo XP machine having an OEM DH-16A1P landed in my basement for HDD wipe and disposal. Just for fun I added some RAM and installed Windows 8.1 to see how it runs (it’s fine). Going to play with the drive, it seemed crippled. While it burned discs OK, the only LiteOn option supported was SmartBurn, and neither Nero CD/DicsSpeed nor Opti Drive Control would do ANYTHING with it except display the ATIP data on an inserted disc.
So I cross flashed it with the last issued LH-16A1P firmware; it burns discs fine and now the hypertuning and overspeed options are available. Thing is: I still can’t do any disc scanning with the utilities above. The START button is greyed out, as are all the TEST items in the pulldown menu. However, Kprobe works! Thinking Win8 might be the issue, I plugged in an external USB drive and everything works just fine on that drive.
I’d read long ago that there was some kind of turf war involving the Nero util and that some drives were effectively “blacklisted” - is the 16A1P one of those?