booting from cd/dvd to install win 10 os UEFI

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  1. TV2
    Posts : 2,015
    W10 Pro 20H2

    Yes, and you would boot that disk in Legacy mode. That is what CSM is for.
      My Computers

  2. Posts : 17
    10 pro 64bit
    Thread Starter

    thanks guys, i will check this tonight on both pcs and the disk when back home from work, and post back to you's
    much appreciated

    - - - Updated - - -

    Hey guys,
    TV2: i am trying to not boot in legacy, but in uefi mode from cd/dvd.. i managed to get it working from usb, but am curious why it didnt work from the dvd

    Ok so yes, bios is up to date on both pc's
    Secure boot is disabled
    I also disabled fast boot
    I just checked the dvd EFI files and the files on the boot disc rufus made... there is quite a few differences.
    I have screenshot a few of them. There is more diffeAttachment 285530Attachment 285531Attachment 285532rences in deeper in the folder paths

    If you would like the deeper folder items, let me know and i will list them
      My Computer

  3. TV2
    Posts : 2,015
    W10 Pro 20H2

    As CountMike posted earlier in this thread, if the software on the DVD was not written to work in the UEFI environment (with an EFI folder) it will not boot in an UEFI environment. It was written to boot in a Legacy environment.
    So you have 2 choices: upgrade the software/installation media or boot it in Legacy Mode.
      My Computers

  4. Posts : 17
    10 pro 64bit
    Thread Starter

    Hey guys, sorry for the late reply, i finally had a chance to play around with this.

    Ok what i found was, when i used ultra iso to open the iso i made from the existing dvd i had, it showed up as udf bootable.
    When i downloaded a new iso from the microsoft win 10 iso maker, and opened that iso in ultra iso, it showed up as EFI bootable.

    I burnt that microsoft made iso to a dvd, and booted into EFI with no problems so i know the settings of the pc was good, the issue was the boot part of the iso, (as you guys mentioned thankyou very much). This same iso boots in legacy mode with no problems.

    I decided to go a little further and was interested in why the existing one i had wouldnt boot in efi regardless it had all the necessary files (that i could see)

    So with ultra iso, i opened the efi boot disc, i deleted all the files within it and copied n paste all the files from the old udf boot disc. Burnt that, it booted as efi but hung on setup.

    So then i tried another way, i opened the original iso, deleted all the files, and copied and pasted all the files from the rufus made boot disco which booted and installed fine via efi.... it didnt boot in either

    So i did a little bit of googling and it seems when u burn a boot disc, different options are selected to make it a legacy boot or efi boot or both
    (this is not an issue when on usb it seems)

    I found a tutorial in showing how to make any iso bootable in efi, efi and legacy, and just legacy,
    So i tried it on my original udf iso, and it works now on both legacy and efi
    It seems like aswell as the efi files being present on the disc, it needs to be burnt with different settings for it to work on efi boot and maybe legacy boot

    The tutorials i found are these.
    FIrst i found this
    How to Convert a Bootable USB to an .iso File
    Which states this doesnt work for efi boot
    In the comments some1 replied and said to do an efi boot, need to follow this guide
    Bootable Media and Images Preparation Guide with How-to Approach

    My issue is now solved, but i thought in case some1 else has this problem, that maybe this information can help them

    Thanks to everyone who took the time to reply, espicially countmike and tv2
    Without your comments on the files, i wouldnt of know where to start

    I dont actually understand what the program actually done, maybe you guys do as your knowledge on this is far more ahead of mine in this area.
      My Computer

  5. TV2
    Posts : 2,015
    W10 Pro 20H2

    Good to hear you got it sorted. Congrats!
    An interesting read. I did not know you could tweak an ISO that way. Learned something new today. Thanks.
      My Computers

  6. Posts : 17
    10 pro 64bit
    Thread Starter

    thanks buddy,

    always something new to learn :)
      My Computer


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