Hello, all. I have a system with several DVD burners in it. One of them is an AD-7200S. Another is a DH20A3S. Both are SATA drives on the same motherboard controller (G31/G35 chipset by Intel). The processor is a Q6600 and the system has 4G of ram. I run XP 32bit on it.
The problem I see is that the drive has great difficulty transfering data fast enough to keep the cache full. On any burn faster than about 6x, the buffer level starts to show large negative going spikes. As the transfer rate increases, the spikes get worse and, eventually, the drive drops to a slower write speed.
This problem has been present on all the recent firmware versions. It currently has 1.0A on it. Thinking that it might be programs running on the sytem, I disabled/stopped: virus checking/scanning, F@H GPU, Prime95, and drive encryption. None of those things made a difference. Even with a completely idle system doing nothing but feeding the burner data, I get these problems.
To verify it wasn't the system having an inability to supply data fast enough, I burn a number of test discs with the DH20A3S. Even at 20x, the cache remained completely full for the whole burn. I reenabled all of the services and programs I had stopped/disabled for the testing and that made no difference--the cache reamined happily full for the whole burn.
Thinking it might be the cable, I replaced the SATA cable to the drive and changed the power connector in which the drive was attached. No difference was made to the problem.
Does anyone have any idea what might be going on? It a shame if I can't continue to use this drive as it's a beautiful writer and, otherwise, works great.
Any suggestions are welcome.