sync and SUSE 9.3

Hello, when I type sync comand the terminal is hangs up... root@myhost:~> ps aux | grep sync root 6927 0.0 0.0 1636 436 tty2 D+ 15:44 0:00 sync root 14284 0.0 0.0 1636 436 tty3 D 16:24 0:00 sync root 21247 0.0 0.0 1740 560 pts/2 R+ 16:30 0:00 grep sync root@myhost:~> sync ... and sleep ------------------ Using SUSE Linux 9.3