i've got an external burner (112 IDE pioneer attached to external casing which converts to USB 2.0). When I use it for reading, the speed goes up to 7000KB/s, then fall back to 4500KB/s. Im using ASUS P5B motherboard & Core 2 Duo 6420(just bought it). I tried to isolate the problem, plugged it to my older computer, it worked fine (more than 10000KB/s). Tried internally in the new comp, also worked fine. So its definetely not the burner nor the external casing adaptor cause it worked on my old comp. Both comp also use the same system (XP sp 2). Connection should be USB 2.0 (otherwise wont go up to 7000KB/s, cause USB 1 only up to 1500KB/s, also its a P5B). Does anyone know what it might be? Thx for your help.