@Code65536: Do I understand you correctly that there are two types of SOHW 1633S, with UDMA2 and UDMA4? My Litey is manufactured in September, stated on the box and the drive itself. As I installed it and rebooted I saw at once that the drive was recognised as ATA66. So that was for me a sign to search in that direction, the connection cable. And with succes. Thank you and all the people who make this site a big success!
@regnim99: They say: if it is not broken, don't fix it. And may be there are two types of LiteOns 1633, I do'nt know, and is yours UDMA2? My motherboard is a DFI KT600, with VIA chipset, and the HD was already connected with a 80 wire cable, marked just like yours and even without a connection plug for a primary slave drive. The DVDRW and CDrom were connected with a 40 wire cable resp. secondary master and secondary slave. Somewhere in this forum I read that a 40 wire cable was good to UDMA3, and while Nero stopt burning with a "communication error", just at the point where the actual burning (after lead in) should begin, pointed me in the direction of the cable. Anyway, if it is alright in your case, enjoy it.
Thanks for your replies. Happy burning!