Corrupt journal and bitmap of a given disk identifier

DirectoryDestoryer.command

#!/bin/bash

#########################################################################################
###
###		DirectoryDestoryer.command
###		Corrupt journal and bitmap of a given disk identifier
###
###		Copyright (c) 2013 Kevin Ross. All rights reserved.
###		
###		Redistribution and use in source and binary forms, with or without modification,
###		are permitted provided that the following conditions are met:
###		
###		Redistributions of source code must retain the above copyright notice, this list
###		of conditions and the following disclaimer.
###		Redistributions in binary form must reproduce the above copyright notice,
###		this list of conditions and the following disclaimer in the documentation
###		and/or other materials provided with the distribution.
###		
###		THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
###		AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
###		IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
###		DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
###		ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
###		(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
###		LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
###		ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
###		(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
###		USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
###
#########################################################################################

DISKID=$1
DISK_PATH="/dev/r${DISKID}"

if [ ! -c "${DISK_PATH}" ]; then
	# print usage and exit
	echo "Error: Please provide a disk ID for a block character device."
	echo "Usage: DirectoryDestoryer.command diskID"
	echo "Usage: where diskID is a block character device in /dev"
	exit 0
fi
	
diskutil unmount "${DISKID}"

echo "Corrupting directory structure..."
dd if=/dev/random of="${DISK_PATH}" oseek=756 count=5120


## Try to remount the volume to see if it worked. It is expected to fail.
echo "Attempting to remount ${DISKID}..."
diskutil mount "${DISKID}"