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The floppies copied with this procedure are indistinguishable from the originals, including their "bootable" status.
The dd command uses some curious parameters, but they were modelled after similar commands on an IBM mainframe. These parameters include:
insert the source floppy
if= specify the input file
of= specify the output file
bs= specify the blocksize (9k is optimal for floppies)
Note that the first step stores the contents of the floppy in the file /tmp/floppy.copy, and this file should be removed when it's no longer needed. But it can be reused to make multiple copies of a floppy (obviously, the floppy disks need to be changed each time).
$ dd if=/dev/fd0 of=/tmp/floppy.copy bs=9k # read source floppy