Sorry Wook I can't help you... I have the exact same settings...
OS: WindowsXP Pro English
IDE1/MASTER (Harddisk) runs in DMA mode 4
IDE1/SLAVE (DVD) runs in DMA mode 2
IDE2/MASTER (Plextor) runs in PIO
IDE1 uses a UDMA100 flatcable (80 pins) and IDE2 uses a standaard UDMA33 one (40 pins).
I have the same problem when I want to write @ 12x while my USB modem is connected. When I remove this device and reboot I can burn without problems. I posted this before too and got no (working) reply
I'll keep my eye open for a sollution...