dd if=/dev/urandom of=/dev/floppyRun it a few times. DOUBLE-CHECK: make sure you double check this command before running it! You don't want to shred the data on your hard disk!
Computer Tips - How can I shred (completely delete all the data) on a floppy?
Date: 2009nov15 OS: Linux Q. How can I shred (completely delete all the data) on a floppy? A. Better than formatting, this will make all data on a floppy unrecoverable by writing random data: