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To make a diskette under Linux (or any other Linux-like operating system),
you must have permission to write to the device representing a 3.5-inch
diskette drive (known as /dev/fd0 under Linux). First, label a
blank, formatted diskette appropriately (eg. ``Boot Diskette'',
``Supplemental Diskette'', etc). Insert it into the diskette drive (but
don't issue a mount command). After mounting the Red Hat Linux CD, change
directory to the directory containing the desired image file, and use the
following command (changing the name of the image file and diskette device
as appropriate):

# dd if=boot.img of=/dev/fd0 bs=1440k

If you need to make another diskette, label another diskette, and run
dd again, specifying the appropriate image file.