Dd unix util producing corrupt ISO images

This is the first time I've ever had reason to post to Apple Support. I'm going insane with this issue.
I am writing an ISO-ripping util that is really just GUI slapped on top of dd, and I can't coax the thing to produce non-corrupt ISOs on Snow Leopard. I have tried the following variations (all with /dev/disk1 unmounted as it should be):
dd if=/dev/disk1 of=/Users/[me]/Desktop/anIso.iso bs=2048 conv=sync,notrunc
dd if=/dev/disk1 of=/Users/[me]/Desktop/anIso.iso bs=2048 conv=notruc
dd if=/dev/disk1 of=/Users/[me]/Desktop/anIso.iso bs=2048
dd if=/dev/disk1 of=/Users/[me]/Desktop/anIso.iso
in all four cases, clicking the iso that is produced gives me a popup that says "the following disk images could not be read" and lists the file. If it's any use, output (at least for the first variation of the command) is:
408258+1 records in
408259+0 records out
836114432 bytes transferred in 513.382815 secs (1628637 bytes/sec)
Following the suggestion of a fellow on stackoverflow, I did an octal dump of the original media and the ISO that dd produces, and then ran diff on them. The output was:
51727460c51727460
< 6165410140
\> 6165414000
(that '\' on the last line isn't in the output. message board was doing some odd auto-formatting thinking it saw a tag)
Do I interpret that to mean that there is exactly one little chunk in the ISO that differs from the original media?
Is this evidence of a bug in Snow Leopard's dd implementation?...or am I just being stupid
Message was edited by: znice
Message was edited by: znice
Message was edited by: znice
Message was edited by: znice

I believe you have a better chance for an answer if you post this in the Unix forum rather than here.
I have little experience with this, but recently had to convert a .ISO download to a .IMG image using dd. The procedure was outlined here. Perhaps it will help you.

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#!/bin/bash
set -e -u
iso_name=archlinux
iso_label="ARCH_$(date +%Y%m)"
iso_version=$(date +%Y.%m.%d)
install_dir=arch
arch=$(uname -m)
work_dir=work
out_dir=out
verbose=""
script_path=$(readlink -f ${0%/*})
# Base installation (root-image)
make_basefs() {
mkarchiso ${verbose} -w "${work_dir}" -D "${install_dir}" -p "base" create
mkarchiso ${verbose} -w "${work_dir}" -D "${install_dir}" -p "memtest86+ syslinux mkinitcpio-nfs-utils nbd curl" create
# Additional packages (root-image)
make_packages() {
mkarchiso ${verbose} -w "${work_dir}" -D "${install_dir}" -p "$(grep -v ^# ${script_path}/packages.${arch})" create
# Copy mkinitcpio archiso hooks (root-image)
make_setup_mkinitcpio() {
if [[ ! -e ${work_dir}/build.${FUNCNAME} ]]; then
local _hook
for _hook in archiso archiso_shutdown archiso_pxe_common archiso_pxe_nbd archiso_pxe_http archiso_pxe_nfs archiso_loop_mnt; do
cp /lib/initcpio/hooks/${_hook} ${work_dir}/root-image/lib/initcpio/hooks
cp /lib/initcpio/install/${_hook} ${work_dir}/root-image/lib/initcpio/install
done
cp /lib/initcpio/install/archiso_kms ${work_dir}/root-image/lib/initcpio/install
cp /lib/initcpio/archiso_shutdown ${work_dir}/root-image/lib/initcpio
cp /lib/initcpio/archiso_pxe_nbd ${work_dir}/root-image/lib/initcpio
cp ${script_path}/mkinitcpio.conf ${work_dir}/root-image/etc/mkinitcpio-archiso.conf
: > ${work_dir}/build.${FUNCNAME}
fi
# Prepare ${install_dir}/boot/
make_boot() {
if [[ ! -e ${work_dir}/build.${FUNCNAME} ]]; then
local _src=${work_dir}/root-image
local _dst_boot=${work_dir}/iso/${install_dir}/boot
mkdir -p ${_dst_boot}/${arch}
mkarchroot -n -r "mkinitcpio -c /etc/mkinitcpio-archiso.conf -k /boot/vmlinuz-linux -g /boot/archiso.img" ${_src}
mv ${_src}/boot/archiso.img ${_dst_boot}/${arch}/archiso.img
mv ${_src}/boot/vmlinuz-linux ${_dst_boot}/${arch}/vmlinuz
cp ${_src}/boot/memtest86+/memtest.bin ${_dst_boot}/memtest
cp ${_src}/usr/share/licenses/common/GPL2/license.txt ${_dst_boot}/memtest.COPYING
: > ${work_dir}/build.${FUNCNAME}
fi
# Prepare /${install_dir}/boot/syslinux
make_syslinux() {
if [[ ! -e ${work_dir}/build.${FUNCNAME} ]]; then
local _src_syslinux=${work_dir}/root-image/usr/lib/syslinux
local _dst_syslinux=${work_dir}/iso/${install_dir}/boot/syslinux
mkdir -p ${_dst_syslinux}
for _cfg in ${script_path}/syslinux/*.cfg; do
sed "s|%ARCHISO_LABEL%|${iso_label}|g;
s|%INSTALL_DIR%|${install_dir}|g;
s|%ARCH%|${arch}|g" ${_cfg} > ${_dst_syslinux}/${_cfg##*/}
done
cp ${script_path}/syslinux/splash.png ${_dst_syslinux}
cp ${_src_syslinux}/*.c32 ${_dst_syslinux}
cp ${_src_syslinux}/*.com ${_dst_syslinux}
cp ${_src_syslinux}/*.0 ${_dst_syslinux}
cp ${_src_syslinux}/memdisk ${_dst_syslinux}
mkdir -p ${_dst_syslinux}/hdt
wget -O - http://pciids.sourceforge.net/v2.2/pci.ids | gzip -9 > ${_dst_syslinux}/hdt/pciids.gz
cat ${work_dir}/root-image/lib/modules/*-ARCH/modules.alias | gzip -9 > ${_dst_syslinux}/hdt/modalias.gz
: > ${work_dir}/build.${FUNCNAME}
fi
# Prepare /isolinux
make_isolinux() {
if [[ ! -e ${work_dir}/build.${FUNCNAME} ]]; then
mkdir -p ${work_dir}/iso/isolinux
sed "s|%INSTALL_DIR%|${install_dir}|g" ${script_path}/isolinux/isolinux.cfg > ${work_dir}/iso/isolinux/isolinux.cfg
cp ${work_dir}/root-image/usr/lib/syslinux/isolinux.bin ${work_dir}/iso/isolinux/
cp ${work_dir}/root-image/usr/lib/syslinux/isohdpfx.bin ${work_dir}/iso/isolinux/
: > ${work_dir}/build.${FUNCNAME}
fi
# Customize installation (root-image)
# NOTE: mkarchroot should not be executed after this function is executed, otherwise will overwrites some custom files.
make_customize_root_image() {
if [[ ! -e ${work_dir}/build.${FUNCNAME} ]]; then
cp -af ${script_path}/root-image ${work_dir}
chmod 750 ${work_dir}/root-image/etc/sudoers.d
chmod 440 ${work_dir}/root-image/etc/sudoers.d/g_wheel
mkdir -p ${work_dir}/root-image/etc/pacman.d
wget -O ${work_dir}/root-image/etc/pacman.d/mirrorlist http://www.archlinux.org/mirrorlist/all/
sed -i "s/#Server/Server/g" ${work_dir}/root-image/etc/pacman.d/mirrorlist
chroot ${work_dir}/root-image /usr/sbin/locale-gen
chroot ${work_dir}/root-image /usr/sbin/useradd -m -p "" -g users -G "audio,disk,optical,wheel" arch
: > ${work_dir}/build.${FUNCNAME}
fi
# Split out /lib/modules from root-image (makes more "dual-iso" friendly)
make_lib_modules() {
if [[ ! -e ${work_dir}/build.${FUNCNAME} ]]; then
mv ${work_dir}/root-image/lib/modules ${work_dir}/lib-modules
: > ${work_dir}/build.${FUNCNAME}
fi
# Split out /usr/share from root-image (makes more "dual-iso" friendly)
make_usr_share() {
if [[ ! -e ${work_dir}/build.${FUNCNAME} ]]; then
mv ${work_dir}/root-image/usr/share ${work_dir}/usr-share
: > ${work_dir}/build.${FUNCNAME}
fi
# Make [core] repository, keep "any" pkgs in a separate fs (makes more "dual-iso" friendly)
make_core_repo() {
if [[ ! -e ${work_dir}/build.${FUNCNAME} ]]; then
local _url _urls _pkg_name _cached_pkg _dst _pkgs
mkdir -p ${work_dir}/repo-core-any
mkdir -p ${work_dir}/repo-core-${arch}
pacman -Sy
_pkgs=$(comm -2 -3 <(pacman -Sql core | sort | sed 's@^@core/@') \
<(grep -v ^# ${script_path}/core.exclude.${arch} | sort | sed 's@^@core/@'))
_urls=$(pacman -Sddp ${_pkgs})
pacman -Swdd --noprogressbar --noconfirm ${_pkgs}
for _url in ${_urls}; do
_pkg_name=${_url##*/}
_cached_pkg=/var/cache/pacman/pkg/${_pkg_name}
_dst=${work_dir}/repo-core-${arch}/${_pkg_name}
cp ${_cached_pkg} ${_dst}
repo-add -q ${work_dir}/repo-core-${arch}/core.db.tar.gz ${_dst}
if [[ ${_pkg_name} == *any.pkg.tar* ]]; then
mv ${_dst} ${work_dir}/repo-core-any/${_pkg_name}
ln -sf ../any/${_pkg_name} ${_dst}
fi
done
: > ${work_dir}/build.${FUNCNAME}
fi
# Process aitab
# args: $1 (core | netinstall)
make_aitab() {
local _iso_type=${1}
if [[ ! -e ${work_dir}/build.${FUNCNAME}_${_iso_type} ]]; then
sed "s|%ARCH%|${arch}|g" ${script_path}/aitab.${_iso_type} > ${work_dir}/iso/${install_dir}/aitab
: > ${work_dir}/build.${FUNCNAME}_${_iso_type}
fi
# Build all filesystem images specified in aitab (.fs .fs.sfs .sfs)
make_prepare() {
mkarchiso ${verbose} -w "${work_dir}" -D "${install_dir}" prepare
# Build ISO
# args: $1 (core | netinstall)
make_iso() {
local _iso_type=${1}
mkarchiso ${verbose} -w "${work_dir}" -D "${install_dir}" checksum
mkarchiso ${verbose} -w "${work_dir}" -D "${install_dir}" -L "${iso_label}" -o "${out_dir}" iso "${iso_name}-${iso_version}-${_iso_type}-${arch}.iso"
# Build dual-iso images from ${work_dir}/i686/iso and ${work_dir}/x86_64/iso
# args: $1 (core | netinstall)
make_dual() {
local _iso_type=${1}
if [[ ! -e ${work_dir}/dual/build.${FUNCNAME}_${_iso_type} ]]; then
if [[ ! -d ${work_dir}/i686/iso || ! -d ${work_dir}/x86_64/iso ]]; then
echo "ERROR: i686 or x86_64 builds does not exist."
_usage 1
fi
local _src_one _src_two _cfg
if [[ ${arch} == "i686" ]]; then
_src_one=${work_dir}/i686/iso
_src_two=${work_dir}/x86_64/iso
else
_src_one=${work_dir}/x86_64/iso
_src_two=${work_dir}/i686/iso
fi
mkdir -p ${work_dir}/dual/iso
cp -a -l -f ${_src_one} ${work_dir}/dual
cp -a -l -n ${_src_two} ${work_dir}/dual
rm -f ${work_dir}/dual/iso/${install_dir}/aitab
rm -f ${work_dir}/dual/iso/${install_dir}/boot/syslinux/*.cfg
if [[ ${_iso_type} == "core" ]]; then
if [[ ! -e ${work_dir}/dual/iso/${install_dir}/any/repo-core-any.sfs ||
! -e ${work_dir}/dual/iso/${install_dir}/i686/repo-core-i686.sfs ||
! -e ${work_dir}/dual/iso/${install_dir}/x86_64/repo-core-x86_64.sfs ]]; then
echo "ERROR: core_iso_single build is not found."
_usage 1
fi
else
rm -f ${work_dir}/dual/iso/${install_dir}/any/repo-core-any.sfs
rm -f ${work_dir}/dual/iso/${install_dir}/i686/repo-core-i686.sfs
rm -f ${work_dir}/dual/iso/${install_dir}/x86_64/repo-core-x86_64.sfs
fi
paste -d"\n" <(sed "s|%ARCH%|i686|g" ${script_path}/aitab.${_iso_type}) \
<(sed "s|%ARCH%|x86_64|g" ${script_path}/aitab.${_iso_type}) | uniq > ${work_dir}/dual/iso/${install_dir}/aitab
for _cfg in ${script_path}/syslinux.dual/*.cfg; do
sed "s|%ARCHISO_LABEL%|${iso_label}|g;
s|%INSTALL_DIR%|${install_dir}|g" ${_cfg} > ${work_dir}/dual/iso/${install_dir}/boot/syslinux/${_cfg##*/}
done
mkarchiso ${verbose} -w "${work_dir}/dual" -D "${install_dir}" checksum
mkarchiso ${verbose} -w "${work_dir}/dual" -D "${install_dir}" -L "${iso_label}" -o "${out_dir}" iso "${iso_name}-${iso_version}-${_iso_type}-dual.iso"
: > ${work_dir}/dual/build.${FUNCNAME}_${_iso_type}
fi
purge_single ()
if [[ -d ${work_dir} ]]; then
find ${work_dir} -mindepth 1 -maxdepth 1 \
! -path ${work_dir}/iso -prune \
| xargs rm -rf
fi
purge_dual ()
if [[ -d ${work_dir}/dual ]]; then
find ${work_dir}/dual -mindepth 1 -maxdepth 1 \
! -path ${work_dir}/dual/iso -prune \
| xargs rm -rf
fi
clean_single ()
rm -rf ${work_dir}
rm -f ${out_dir}/${iso_name}-${iso_version}-*-${arch}.iso
clean_dual ()
rm -rf ${work_dir}/dual
rm -f ${out_dir}/${iso_name}-${iso_version}-*-dual.iso
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make_basefs
make_packages
make_setup_mkinitcpio
make_boot
make_syslinux
make_isolinux
make_customize_root_image
make_lib_modules
make_usr_share
make_aitab $1
make_prepare $1
make_iso $1
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echo "usage ${0} [options] command <command options>"
echo
echo " General options:"
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echo " Default: ${iso_name}"
echo " -V <iso_version> Set an iso version (in filename)"
echo " Default: ${iso_version}"
echo " -L <iso_label> Set an iso label (disk label)"
echo " Default: ${iso_label}"
echo " -D <install_dir> Set an install_dir (directory inside iso)"
echo " Default: ${install_dir}"
echo " -w <work_dir> Set the working directory"
echo " Default: ${work_dir}"
echo " -o <out_dir> Set the output directory"
echo " Default: ${out_dir}"
echo " -v Enable verbose output"
echo " -h This help message"
echo
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echo " purge <mode>"
echo " Clean working directory except iso/ directory of build <mode>"
echo " clean <mode>"
echo " Clean working directory and .iso file in output directory of build <mode>"
echo
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echo " <mode> Valid values 'single' or 'dual'"
echo " <type> Valid values 'netinstall', 'core' or 'all'"
exit ${1}
if [[ ${EUID} -ne 0 ]]; then
echo "This script must be run as root."
_usage 1
fi
while getopts 'N:V:L:D:w:o:vh' arg; do
case "${arg}" in
N) iso_name="${OPTARG}" ;;
V) iso_version="${OPTARG}" ;;
L) iso_label="${OPTARG}" ;;
D) install_dir="${OPTARG}" ;;
w) work_dir="${OPTARG}" ;;
o) out_dir="${OPTARG}" ;;
v) verbose="-v" ;;
h|?) _usage 0 ;;
_msg_error "Invalid argument '${arg}'" 0
_usage 1
esac
done
shift $((OPTIND - 1))
if [[ $# -lt 1 ]]; then
echo "No command specified"
_usage 1
fi
command_name="${1}"
if [[ $# -lt 2 ]]; then
echo "No command mode specified"
_usage 1
fi
command_mode="${2}"
if [[ ${command_name} == "build" ]]; then
if [[ $# -lt 3 ]]; then
echo "No build type specified"
_usage 1
fi
command_type="${3}"
fi
if [[ ${command_mode} == "single" ]]; then
work_dir=${work_dir}/${arch}
fi
case "${command_name}" in
build)
case "${command_mode}" in
single)
case "${command_type}" in
netinstall)
make_common_single netinstall
core)
make_core_repo
make_common_single core
all)
make_common_single netinstall
make_core_repo
make_common_single core
echo "Invalid build type '${command_type}'"
_usage 1
esac
dual)
case "${command_type}" in
netinstall)
make_dual netinstall
core)
make_dual core
all)
make_dual netinstall
make_dual core
echo "Invalid build type '${command_type}'"
_usage 1
esac
echo "Invalid build mode '${command_mode}'"
_usage 1
esac
purge)
case "${command_mode}" in
single)
purge_single
dual)
purge_dual
echo "Invalid purge mode '${command_mode}'"
_usage 1
esac
clean)
case "${command_mode}" in
single)
clean_single
dual)
clean_dual
echo "Invalid clean mode '${command_mode}'"
_usage 1
esac
echo "Invalid command name '${command_name}'"
_usage 1
esac
Last edited by gav989 (2012-02-12 10:59:11)

thanks for that, according to this it should be run like
/path/to/build.sh build single netinstall
from inside the chroot
posting this for my own reference and in case it helps others, will mark as solved
thanks again for your help
Last edited by gav989 (2012-02-12 10:58:04)

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<http://www.macupdate.com/app/mac/13388/bonjour-browser>

How does one Create Bootable DVD from downloaded iso image in Windows?

I have a completely empty system I want to load Solaris Express on. I have access to web on a Windows XP machine and have downloaded the Solaris iso image. Using WindowsXP facilities simply copies the iso image as an intact iso image file and resulting disc is not bootable. Windows knowledge base very conveniently says that what happened to me is what happens. No obvious referral to how to do it....
A) So for a non-Windows savy person who does not want to become Windows savy (That is why I downloaded Solaris!) Where is a set of instructions on how to (inside Windows XP) "extract" an iso image to a CD / DVD disk so it will be bootable?
B) It sure would be nice if Solaris were able to be loaded onto a USB Flash drive and booted at will from any USB computer. Just plug it in and boot. Has this been done?
C) Getting a physical disk by snail mail from Sun is very slow for me.... (3 weeks and still watching the mail box...)

A) So for a non-Windows savy person who does not want to become Windows savy (That is why I downloaded Solaris!) Where is a set > of instructions on how to (inside Windows XP) "extract" an iso image to a CD / DVD disk so it will be bootable?http://www.sun.com/software/solaris/download_instruction.xml
You probably copied the .iso file as one single very large file onto media. Instead, you can use a utility such as Roxio DVD Creator or Nero (or freeware like cdrecord) , and select the option to burn an image that already exists. No special boot options are needed, because the ISO image already contains the boot information needed.
B) It sure would be nice if Solaris were able to be loaded onto a USB Flash drive and booted at will from any USB computer. Just plug > it in and boot. Has this been done?With the Newboot project introduced into Solaris Express, I believe it is now possible. I'm not a USB expert, though, so cannot say for sure.
C) Getting a physical disk by snail mail from Sun is very slow for me.... (3 weeks and still watching the mail box...)I can't comment on that.
-- Alan

Can't burn iso image

I used to be able to burn an iso image from the context menu by clicking on 'Burn "*" to Disc...', inserting a disc and let it burn. Now when I try to burn an iso image by using the context menu a box pops up saying 'Are you sure you want to burn the contents of "Untitled Disc" to a disc'. If I click yes, it burns the iso image as a file onto the disc.
Anyone know why?

When I use disk utility everything works fine. But when I control + click on an iso, cdr, or dmg it puts the iso on the disc as a file. It just started doing this a couple days ago. Its a huge hassle to have to go to disk utility everytime I want to burn a disc

How to create a USB recovery flash drive using recovery ISO image?

This “HowTo” provides information and instruction how to create a USB recovery media flash drive using the Toshiba recovery ISO image files or Toshiba Recovery discs (DVDs)
To create a USB recovery media flash drive, a USB flash drive with at least 16GB disk space is suggested (depends on the size of the ISO images or recovery discs).
Note: Since 2015 the ISO layout has changed and a different procedure must be processed to create the USB media. The new recovery media type can be identified by the names of the ISO files.
More info: http://aps2.toshiba-tro.de/kb0/HTD4103KB0000R01.htm

Yes, that article should apply to tablets.
But if your USB recovery drive does not get recognized then it must be corrupted - you should be able to format your disk and perhaps try to see if creating a Recovery device on other devices will make it recognizable on your tablet 2.

?Burning ISO images for booting on intel.

I have a couple of iso images I'm trying to burn (DVD) as bootable on my iMac. I did it once before under 10.5.8, but for can't remember what I did. Images are vmware ESXi image and a windows server 2008 image. Just used what is on OS X. Do not have any 3rd party software.
Thanks for your help

Use Disk Utility. Drag the .iso file to the sidebar, click it once, then press Burn in the toolbar.

I want to make an .iso image of my Windows 7 Installation DVD in OS X

Greetings,
I am writing because my intent is to make a .iso file of my Windows 7 Installation disc using Disk Utility in OS X. I would like to keep a back up (both in a external drive and the cloud) of the image in case the DVD gets damaged or the SuperDrive goes south in the distant future (call it an insurance if you will). During the last 6 months I have been working in trying to get my application installers (both OS X and Windows) in the cloud as I find them more convinient and less likely to degrade in quality since the digital download does not get "scratched" per se, and downloads can be checksummed to ensure file integrity.
Is there any way in which I can make an .iso image of my Windows 7 DVD using OS X Disk Utility?
Thanks for any assistance on this matter.

https://www.macupdate.com/app/mac/30663/anytoiso-lite
found using this google search
https://www.google.dk/search?client=opera&q=create+an+iso+file+in+osx&sourceid=o pera&ie=UTF-8&oe=UTF-8

Add Iso image in the Pxe sever of WDS

Hello sorry for my bad english.
Is there any solution to add an iso image (boot cd like "utltimate boot cd") in the PXE menu of WDS ?
Thanks a lot

You keep saying "startup image" and "discover image" and that is confusing things. There are three image type with WDS:
1. Boot Images - Used to startup the hardware and pull down the
Install Image from WDS and apply the Install Image to the local HD.
2. Install Image - Pulled down to the machine after starting with the
Boot Image and is applied to the HD. The machine reboots and runs from the applied
local Install Image. The Install Image can be a completed installation that is "ready to run" or a "wizard driven" installation which will go through the process of installing Windows on a machine (the way a factory
Windows install disk does).
3. Capture Image - This image is a Boot Image that contains a wizard driven copy of ImageX and is used to create an Install Image from a chosen partition of the local HD on the Master Model Machine. Note, it only captures
a single chosen partition, not the entire drive, and it will only acknowledge OS boot partitions that have had Sysprep run on them. It creates two copies of an Install Image,...one on the WDS Server,...and one on a local destination such as an external USB
HD connected to the source machine during the process.
If you have a custom bootable utility disk of some kind then that would be considered a
Boot Image. So to answer your direct question, as I understand it,...go to the WDS managemant console and tell it you want to import a
Boot Image. Locate and browse to the "boot.wim" file that would be located somewhere on the Boot CD/DVD that you said you already have.
If your bootable CD/DVD is of some other type that does not contain a "boot.wim", then you simply cannot do what you want to do. Boot Images are "special",...when they load they
first create a RAM Drive and then load into, and run from, that RAM Drive. You cannot do that with a Boot Disk Tool that is DOS or Linux based. It must be a Windows Based boot disk with the copy of Windows contained within the "boot.wim" file.
If I knew specifically what this boot disk you have (gotten from a friend or whatever) specifically is, then maybe I could tell you if you have any options.

Dd unix util producing corrupt ISO images

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