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  • Re: ISO 9660 (version Joliet Extension)

    From Dan Ritter@21:1/5 to William Torrez Corea on Mon Feb 3 00:10:01 2025
    William Torrez Corea wrote:
    Trying start the operating from boot Acer Aspire ONE

    I made a bootable operating system from USB with gnome-disk-utility 43.0 UDisks 2.9.4 (built against 2.9.4).

    I change the options in the BIOS but I don't get anything.

    If you are using a debian installation or live image, you should
    not use UDisks but rather cp or dd to put the image directly on
    the raw disk, e.g.

    cp debian-live-cd.img /dev/sde

    What image are you using?

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  • From Charles Curley@21:1/5 to William Torrez Corea on Mon Feb 3 05:00:01 2025
    On Sun, 2 Feb 2025 16:55:39 -0600
    William Torrez Corea <[email protected]> wrote:

    I am using the following image:

    *MS DOS 6.22 Bootable iso*

    https://archive.org/details/ms-dos-6.22_dvd

    Did you notice the following on that web page:

    If you need to burn it to a portable storage device, like USBs or
    dvd disks, unfortunately it will not work. Instead, use Rufus and
    select the "FreeDOS" option.

    You might do better with FreeDOS.

    --
    Does anybody read signatures any more?

    https://charlescurley.com
    https://charlescurley.com/blog/

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  • From Thomas Schmitt@21:1/5 to William Torrez Corea on Mon Feb 3 09:40:01 2025
    Hi,

    William Torrez Corea wrote:
    I am using the following image:
    MS DOS 6.22 Bootable iso
    https://archive.org/details/ms-dos-6.22_dvd

    Charles Curley quoted from there:
    "If you need to burn it to a portable storage device, like USBs or
    dvd disks, unfortunately it will not work."

    I downloaded
    https://archive.org/download/ms-dos-6.22_dvd/MS-DOS%206.22.iso
    and inspected it by

    xorriso -indev "MS-DOS 6.22.iso" \
    -report_el_torito plain -report_system_area plain

    The image file is indeed an ISO 9660 filesystem with an El Torito boot
    catalog:

    El Torito images : N Pltf B Emul Ld_seg Hdpt Ldsiz LBA
    El Torito boot img : 1 BIOS y fd1.4 0x0000 0x06 1 26
    El Torito img blks : 1 720

    The boot image is an emulated floppy disc of 1440 KiB.
    So the ISO 9660 image is supposed to boot via legacy PC-BIOS from optical media: CD, DVD, BD.

    One could try to boot it by submitting the image as virtual CD-ROM to a
    virtual machine with SeaBIOS or alike (not OVMF).

    The files in the ISO bear dates from 1994, whereas the root directory
    and the PVD timestamps say that the ISO image was made in 2005.
    So it is questionable whether the software in the ISO is able to cope
    with contemporary real hardware.

    -----------------------------------------------------------------------

    I see another unplausible statement in the description:

    "This is a portable MS-DOS ISO file. In case your machine does not
    support a BIOS for some reason, this will be very helpful."

    No BIOS = no booting via El Torito.

    The author obviously meant something else. Maybe there have been BIOS implementations which only booted from floppy disks, real and emulated,
    but not from no-emulation boot images (like Debian ISOs offer).

    Recently the german Linux Magazin re-published the first SuSE ISO which
    had no El Torito boot equipment but a bootable floppy image in it. The
    aspiring user was expected to copy the image out of the ISO filesystem
    onto a real floppy, which then could be used to boot the first stage and
    was able to use the CD-ROM with the ISO filesystem.

    Obviously the creator of the MS-DOS ISO did not expect that the boot
    image has to be put on a real floppy, or else the boot image would be
    a named file in the ISO 9660 filesystem tree.


    Have a nice day :)

    Thomas

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