actually, this problem I have solved.
I put a thread here, just in case any other guys may fall in the same trap as I did.
software: k3b-0.11.18-0.1.3.kde xcdroast-0.98a15-6.i386.
cd-r/w: HL-DT-ST CD-RW GCE-8481B
cd-w disk: 52x compatible
the problem was:
no matter what I try, cd-r/w just burns at about 16x, ant tends to currupt the cd-rom.
I waste half a dozen disk here.
download kernel-2.6.10 tar ball, compile and install it.
I did two changes to the config file
1, compile ide_cd in kernel, before it was compiled as a module
2,change default codepage for fat partition from cp936 to cp437
I dont know which of the changes do the help, but it does work, and now I use
I hope this may help somebody. Good luck!