Originally posted by easy-going-man
For example while I burn a Backup DVD (2,4x speed) the system performance decreases extremely. It takes ages to open the Internet Explorer or any programs. I observed, that this does not occur at the beginning of the burning process but approximately after about 50%.
I can't help you much except to say that I experienced a similar problem with my Sony DRU-500AX on an Intel P4 system (WinXP SP1, Asus P4PE motherboard using Intel 845PE chipset). The symptoms were very similar. It would start out okay, then bog down a few minutes in to the burning process. The difference was that I saw it in all my burning apps, including DVD Decrypter in ISO Write mode, and RecordNow DX, if I remember correcly.
One question: When the problem is happening, what is your CPU usage like? In my case it was very low (like 5%) but the HD would be thrashing like crazy, and that was causing everything to slow down (Even getting the Start menu to come up would take like 5+ seconds). The problem seemed to be worse when burning large files (e.g. a VIDEO_TS folder or multi-gig ISO file).
I reinstalled WinXP and the problem went away. At first I thought the problem was in my ATA drivers (Intel Application Accelerator) but then I reinstalled them and it was still fine. About the only thing I can think of was that it was some kind of driver conflict between Nero and RecordNow. Now that I think of it, I never reinstalled RecordNow this time around, so maybe that was the culprit.