When I issue sudo tail -f/var/log/syslog in order to try and track down an
external drive problem I get the following:

Jan 11 07:56:00 kernel: [17179663.076000] atkbd.c: Unknown key released (translated set 2, code 0x81 on isa0060/serio0).
Jan 11 07:56:00  kernel: [17179663.076000] atkbd.c: Use 'setkeycodes e001 <keycode>' to make it known.
Jan 11 07:56:00  kernel: [17179663.084000] atkbd.c: Unknown key pressed (translated set 2, code 0xd9 on isa0060/serio0).
Jan 11 07:56:00 kernel: [17179663.084000] atkbd.c: Use 'setkeycodes e059 <keycode>' to make it known.
Jan 11 07:56:11  kernel: [17179674.012000] atkbd.c: Unknown key pressed (translated set 2, code 0xd9 on isa0060/serio0).
Jan 11 07:56:11 kernel: [17179674.012000] atkbd.c: Use'setkeycodes e059 <keycode>' to make it known.

I have no idea what this means. atkbd presumably means AT keyboard? Can
anybody translate the rest and point me at what might be wrong with my
keyboard setup?

By the way ,the server is CentOS 5.3 x86_64, and kernel version is 2.6.18-128