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Old 03-16-2008, 02:47 PM   #1
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Compiled Fedora 8 Bootable DVD :- isolinux:image checksum error

I am new to Linux and use Nero on Windows to burn CD/DVD.

I have the Digit-Feb-08 DVD which is of 8.4 GB capacity. It is a bootable Fedora 8 DVD plus it contains additional tools & utilities for Windows platform. If I minus the Windows utilities the 'fedora only content' will be well below 4.0 GB. I wanted to make a bootable Fedora 8 disk on a 4.6 GB DVD by skipping the windows utilities from the original Digit-Feb-08 DVD.

I did it like that. i dumped the fedora only content to a folder (I am sure I didn't miss any file/folder except the windows utilities.)
i extracted the boot image of the original bootble DVD using BBIE (BART's Boot Image Extractor) to a separate location. Then i compiled a bootable DVD in Nero, gave the extracted (by BBIE) bootimage.bin, added all dumped content, ensured emulation type is set to -No emulation & Number of loaded sectors to 4 and burned a DVD.

On booting from that DVD i get a error message like:- " isolinux [ver xx.xx.xx.xx] :image checksum error, sorry "

Please help me ;My need is to compile succesful Linux boot images (.nrg or .iso) as per my requirement i.e I should add /remove extra contents easily before burning the bootable disk . For Windows OS making bootable disks is not a problem since there is no checksum verification, where as for making a Linux bootable CD/DVD this type of problem is frequent.

Thank you for your patience in reading this post.
Old 03-16-2008, 03:21 PM   #2
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Even I have WIndows XP and suse 10.3 if I down load a iso 9660(boot able) I write down the checksum from the website and I use K3B (LINUX) it load the iso file and calculate the checksum if the checksums are the same it means only that there no messing up with the file I down load to burn and that is it
Some distro also gave the possibility of a media check before installing if it is case with the distro you have down load use it to be sure that the cd or dvd you burn is correct

all the best
Old 03-27-2008, 08:14 PM   #3
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@ ronlau9

You didn't read my question thoroughly so the answer doesn't carry any meaning for my query.
Old 03-28-2008, 01:52 AM   #4
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When downloading large files like a Linux distribution things can go wrong, one little error can produce steam out of your ears. That's why Linux distributions compare the md5 or sha1 sums or both of every file sitting on the server for that ISO to the files in the ISO on your drive. One of those files is an MD5 or SHA1 text file containing the sum for every file in the ISO, if you remove files, you'll need to edit that file to reflect the changes.
For Windows OS making bootable disks is not a problem since there is no checksum verification
Probably because Windows is normally distributed on disks and not the internet, the sums have been verified prior to including them on the disk.

There is usually a sort of "autorun" application that loads when inserting an OS installation disk, in Linux it's commonly called "the installer". If you remove some of the features the installer is programmed to include in some way, you might have issues in that arena also.

Last edited by Junior Hacker; 03-28-2008 at 01:54 AM.



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