USB booting :: Questions about DSL's USB pendrive installation

What is the "standard usb-boot floppy"

I see. I didn't want to use that because I also want to use the
boot floppy disk also for Puppy Linux booting...

Anyway, I've found a solution for my problem. I can start DSL using Linld. The point is, it has to be started inside the isolinux directory (for whatever reason). I did
linld image=linux24 initrd=minirt24.gz
and - voila - DSL was booting.

Thanks for all the offered help.