Extract an El Torito boot image from an ISO file under linux

Make sure you have the package genisoimage installed on your system. If your running Ubuntu Feisty like myself, you should be able to get if from the universal repository.

[code lang=”bash”]

billy@linux:~/Microsoft/W2K3ENT$ geteltorito win2k3ent.iso > win2k3ent.img
Booting catalog starts at sector: 20
Manufacturer of CD: Arnes Boot Record
Image architecture: x86
Boot media type is: no emulation
El Torito image starts at sector 541 and has 4 sector(s) of 512 Bytes
Image has been written to stdout ….
[/code]

As you can see the image file is now present in the same directory as the original image file.

[code lang=”bash”]
billy@linux:~/Microsoft/W2K3ENT$ ls -l
total 603664
-rw-r–r– 1 billy billy 2048 2007-06-07 11:29 win2k3ent.img
-rw-r–r– 1 billy billy 617533440 2007-06-06 22:33 win2k3ent.iso
-rw-r–r– 1 billy billy 29 2007-06-06 22:33 win2k3ent_serial.txt
billy@linux:~/Microsoft/W2K3ENT$
[/code]

2 thoughts on “Extract an El Torito boot image from an ISO file under linux

  1. Thnx!
    Now I try to create a USB based on bootable CD.
    I feel that to do this I need to copy all files from CD and start the boot image by boot loader.
    Isn’t it?

  2. That post was written about how to extracting the boot loader from a Windows installation disk, so I’m not sure if it’s applicable. If you get it to work under USB then let me know and I’ll add something to the instuctions.

    Thanks,

    Billy

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