how to write a floppy using dd?

[Carlos Carvalho <carlos@snfep1.if.usp.br>]

I tried to write the installation diskettes with the command

  dd if=1440_boot_floppy of=/dev/fd1 bs=18k

It showed

80+0 records in
80+0 records out

When the prompt returned I removed the floppy and tried to boot the
installation machine with it, but didn't work. I was forced to use
rawrite2, and it then worked, on the same floppy (but recorded with
another, dos machine).

Did I do something wrong?

Carlos