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Thread: [usb bootable] can not boot when bootable iso put on stick

  1. #1
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    Default [usb bootable] can not boot when bootable iso put on stick

    I use an iso (utils) that could be booted using vmware it always booted and worked (but I think vmware considers this is a DVD/CD).
    I want to put it on a usb stick because the computers to be recovered have no DVD/CD reader.

    I used all I have found from internet howtoes and opensuse howtoes, this usb stick can not be booted on another computer (I see the usb stick in the boot menu but there is nothing more than an error that I can't read when I hit return, grub2 took the relay).

    Is anybody could give me a way to help me put this iso (bootable but taken as a CD/DVD) on a usb stick ?

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    Default Re: [usb bootable] can not boot when bootable iso put on stick

    I just copy the iso directly to the usb device. However, you have to copy to the raw device, rather than to the file system.

    On this computer, a USB device usually shows up as "/dev/sdd". So I use:
    Code:
    dd_rescue ISOFILE.iso /dev/sdb
    (replace "ISOFILE.iso" with the actual file name). And note that "dd_rescue" is in the repos so you can easily install it.

    Other methods that probably work:
    Code:
    dd if=ISOFILE.iso of=/dev/sdd
    or
    cp ISOFILE.iso /dev/sdd
    or
    cat ISOFILE.iso > /dev/sdd
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  3. #3
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    Default Re: [usb bootable] can not boot when bootable iso put on stick

    I always used /dev/sdd as the target of my copies... I will try with dd_rescue than dd.

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    Default Re: [usb bootable] can not boot when bootable iso put on stick

    Quote Originally Posted by soundlord View Post
    I always used /dev/sdd as the target of my copies... I will try with dd_rescue than dd.
    Ooow, take care. Make sure the /dev/sd* entry is the correct one, dd will destroy everything on that device. I always check, with
    Code:
    ls -ltr /dev/sd?
    right after inserting the USB stick. The last line in the output tells you which /dev/sd entry to use.
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    Default Re: [usb bootable] can not boot when bootable iso put on stick

    The logical structure of a bootable CD/DVD is different from the logical structure of a USB.

    Copying an iso to a USB is not guaranteed to work. It will only work if the iso was built with an appropriate hyrbrid structure such as would allow it to work either way.

    Many linux isos are built in a suitable way. But I have run into some isos that don't work. Maybe you have one of those.
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    Default Re: [usb bootable] can not boot when bootable iso put on stick

    The logical structure of a bootable CD/DVD is different from the logical structure of a USB.
    That is why I said that this iso i taken as a CD/DVD... ^^

    I will try rufus under windows :[ as there is nothing as far as I know that will help my build a bootable usb stick with an iso that is booted on vmware...

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    Default Re: [usb bootable] can not boot when bootable iso put on stick

    Some rufus options modify the iso and mess up openSUSE installer. Be sure to use only dd option. You want a pure unchanged binary copy to the device not a partition on the device.

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    Default Re: [usb bootable] can not boot when bootable iso put on stick

    Quote Originally Posted by gogalthorp View Post
    Some rufus options modify the iso and mess up openSUSE installer. Be sure to use only dd option.
    Right. However, the OP does not seem to be working with the openSUSE installer. He mentioned an iso with utility tools. So maybe rufus defaults work for that. Or maybe one of the other USB builder applications works. Hard to guess without knowing more about what iso he is trying to use.
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