This took me hours and hours of testing in order to understand what was going wrong, so here we go: Nforce 2 chipeset (Asus A7N8X) Channel 0 --------------- Master: HDD IBM DTLA-307030 (Ultra DMA 5) Channel 1 ---------------- Master: Teac CDRW CD-W522E (52x24x52x , just bought it) Slave: Toshiba DVD ROM 16x48x Now take a look of my burners write transfer rate tested with nero cd speed Is this normal? I don't think so. So I started making hundreds and hundreds of test until I did this: channel 0 ------------ Master: HDD Slave: DVD-ROM Channel 1 --------------- Master : CD-RW (alone) Now my write transfer test looks like this: Strange?? Well and now take a look what happens when I completely remove my toshiba DVD-ROM and have Channel 0:HDD alone Channel 1:CD-RW alone wtf is going on????? Is this a hardware or software or what issue? UDMA is on for all devices, 80 pin cables used and windows configuration is optimal. Anyone out there that has the same hardware and same problems? Please all of u with the same DVD-ROM do a write transfer test with the nero cd speed. It wont burn a cd (it is a simulation) and it will only take u a couple of minutes. Thanks in advance.