Hello! I'm not sure, whether this is the right topic here, but maybe there's an expert in computer hardware... I have two DVD recorders in my computer (P4; 2.6Ghz; 1.5GB RAM). The OS (Win 2000) boots from a RAID controller, the data I want to record on DVD are on another IDE harddisk, connected to the IDE bus of the mainboard, one of the two DVD recordes is connected to the other DE bus of the mainboard, and the other recorder to a PCI-card IDE controller. When I start recording at high speed (e. g. 8*DVD or 44*CD), everything is right for some seconds. Then I get buffer underrun. The CPU utilisation behaves very strange: First it's around 20%, then starting oscillating between 0% and 100%, while buffer content also oscillates and finally causes an underrun. Simultanousely running a program with quite high CPU usage makes things better!!! But not always. If it is possible preventing CPU usage from oscillating, then it'll always prevent underrun completely. E. g. watching TV in full frame with a PCI tuner card on the same computer while writing to DVD is sometimes a solution. Copying the other way from DVD to harddisk with the same drives is no problem at all; CPU utilisation keeps very small and copying in this direction is very fast. Also copying from HD to HD achieves nearly 100MB/s!!! Does anyone have an idea what can cause this?
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