well, i recreated my problem and k3b was burning allright, then the harddisk gradually became more and more active and the process k3b which had about 50% CPU gradually moved down the CPU list and kswapd0 moved up the list. here's the last outtake from top, i get 20 mins response time when the harddisk goes nuts at the end:) Tasks: 86 total, 2 running, 84 sleeping, 0 stopped, 0 zombie Cpu(s): 0.3% us, 1.7% sy, 0.0% ni, 0.0% id, 97.0% wa, 1.0% hi, 0.0% si Mem: 515848k total, 512060k used, 3788k free, 120k buffers Swap: 1534196k total, 98324k used, 1435872k free, 8132k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 33 root 15 0 0 0 0 S 0.9 0.0 0:04.08 kswapd0 2806 root 15 0 67984 1152 48m D 0.3 0.2 13:35.12 X 3032 kha 15 0 13844 744 11m S 0.3 0.1 0:00.23 pam-panel-icon 3034 kha 25 10 33880 1408 22m R 0.3 0.3 8:09.09 rhn-applet-gui 3066 kha 15 0 19568 608 16m D 0.3 0.1 0:01.25 clock-applet 3875 root 16 0 2268 796 1620 R 0.3 0.2 0:00.82 top 1 root 15 0 2928 292 1316 S 0.0 0.1 0:01.77 init 2 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/0 3 root 5 -10 0 0 0 S 0.0 0.0 0:00.07 events/0 4 root 5 -10 0 0 0 S 0.0 0.0 0:00.02 khelper 5 root 15 -10 0 0 0 S 0.0 0.0 0:00.00 kacpid 19 root 5 -10 0 0 0 S 0.0 0.0 0:00.02 kblockd/0 20 root 15 0 0 0 0 S 0.0 0.0 0:00.05 khubd 31 root 15 0 0 0 0 S 0.0 0.0 0:00.04 pdflush 32 root 15 0 0 0 0 S 0.0 0.0 0:00.08 pdflush 34 root 8 -10 0 0 0 S 0.0 0.0 0:00.00 aio/0 146 root 15 0 0 0 0 S 0.0 0.0 0:00.00 kseriod 185 root 15 0 0 0 0 S 0.0 0.0 0:00.14 kjournald kh