How to Create a boot floppy?

[StormLord]

I though that creating a boot floppy for my A1200 was just a matter of formating
disk 880k and craeting an S directory where the startup-sequence will lie there.
but no matter what I tried I couldn't succeed.
 everytime that I cycle the power from my amiga and from early menu selecting DF0 as boot device
and also selecting boot without S-S always sys partition is my OS3.9 partition.
Do I have to do some "special" kind of format?

[StormLord]

Install DF0: !!!!!!!!!!
THANKS!
I had forgot this command... actually I don't remember if I ever used it.
that did the trick.....
anyone knows what this command do to the floppy? maybe something like the HDtoolbox do
when we select the "bootable" checkbox?

What I want to do is: create a bootable floppy that will mount the CD..
I copied from my 3.9 partition the handler (cachecdfs) and from dosdrivers the mountlist cd0
when I start from that floppy, and when I write "mount cd0:"
I get a prompt without any error, but when I try to make a dir on cd0: it says that its not a dos disk in drive...
any help?