Suspected BUG in dd command

[Gaetano Arena]

I am trying to create a GRUB boot floppy as per "The GRUB manual"
The first line: dd if=stage1 of=/dev/fd0 bs=512 count=1
works and loads on the floppy apparently properly.
The second line: dd if=stage2 of=/dev/fd0 bs=512 seek=1
gives the error message: /dev/fd0, Invalid argument.
Can anybody Help me.?
G. Arena       address@hidden

My system;
500 MHz AMD K6-II, ASUS P5A-B MB
BIOS: Award (P5A-B)
Installation: Mandrake 8, KERNEL 2.4.8   (Same condition experienced
with Caldera 2.4, KERNEL 2.2.14