Installing Win10 from Mounted ISO

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  1. RBT
    Posts : 54
    Windows 10 Home
       #1

    Installing Win10 from Mounted ISO


    Win10 Ver 22H2 (OS Build 19045.3208)
    After help from this Forum, I've installed Windows 10 quite a few times over the yrs on several Laptops. But I'm still a bit weak on understanding the logic of different methods, which led me back here again for correction or comments.

    Once in the past I did Windows 10 repair by running the Setup.exe file on the install USB root folder.
    Otherwise always did clean installs of Windows 10 from booting to an install USB. But recently read several online articles about Clean installing Windows directly from a mounted windows ISO (with no USB), so tried it on spare Laptop.

    Preliminaries: Saved the Win.ISO to a Data partition (not the existing windows partition). Then mounted ISO from there (via Explorer file manager). I think my first error was running the setup.exe from root folder of image folder structure, instead of the setup.exe from the sub folder named Sources.

    The install completed ok with no issues, but left me with 3 questions if anyone would be so kind as to comment or educate me in this area.

    1. I did not realize windows had the ability to make a mounted ISO file persistent thru several reboots. I don't think I understand the run logistics of the setup.exe installer(?). Appreciate any enlightenment.

    2. Also some Web sites showed the ISO saving to the desktop on the existing main windows partition and then mounting it from that location. I don't understand how a mounted ISO file sitting on an existing windows partition can be mounted to run a Clean install, keep Nothing, without deleting the ISO file that it was mounted from during the process(?). Appreciate any enlightenment.

    3. In past when booting to install USB for clean installs of Win10, I've always chose the option to delete all the old windows partitions. But running the image root folder setup.exe I never saw that option.
    If I had run the setup.exe from the sub folder named Sources, would that have given me the option to delete the old windows partition? (or does one have to run the install from a bootable USB to get that?)
      My Computer


  2. Posts : 122
    Windows 10 Pro
       #2

    RBT said:
    I don't understand how a mounted ISO file sitting on an existing windows partition can be mounted to run a Clean install, keep Nothing, without deleting the ISO file that it was mounted from during the process(?).
    The iso file ends up in the Windows.old folder.

    The file only needs to be mounted once as the entire setup gets copied to another place on Drive C, from which installation resumes.

    Partitioning is available in a booted setup only, and of course Windows cannot be deleted while performing the setup task.
      My Computer


  3. Posts : 43,412
    Win 10 Pro (22H2) (2nd PC is 22H2)
       #3

    How can you install Windows without external media?

    (I think that's what you're hoping to do?) If so, please see

    Clean Install Windows 10 without DVD or USB Flash Drive

    - from the huge searchable Tutorials section. Do have a look... excellent.
      My Computers


  4. Posts : 17,049
    Windows 10 Home x64 Version 22H2 Build 19045.4170
       #4

    RBT said:
    Saved the Win.ISO to a Data partition (not the existing windows partition). Then mounted ISO from there (via Explorer file manager).
    If you did not extract the ISO contents to a drive and boot from that drive then what you did was a Repair install not a Clean install.
    Repair Install - TenForumsTutorials
    Clean Install - TenForumsTutorials

    All the best,
    Denis
      My Computer


  5. RBT
    Posts : 54
    Windows 10 Home
    Thread Starter
       #5

    Try3 said:
    If you did not extract the ISO contents to a drive and boot from that drive then what you did was a Repair install not a Clean install.
    Repair Install - TenForumsTutorials
    Clean Install - TenForumsTutorials
    All the best, Denis
    Thanks much for excellent input and links from Volume Z, dalchina and Try3. I did read all the links and a few more, doing my best to decipher all the aspects. Below are 3 items I still need further delineation.

    from, Clean Install Windows 10
    about 1/3 down the page one,
    [-Shawn said,
    If you want to have (recommended) the 450 MB (UEFI-GPT) or 500 MB (Legacy BIOS-MBR) System Reserved partition in addition to the Windows C: partition on a HDD or SSD after installation, then you would need to make sure that all partitions on the drive have been deleted until it is only unallocated space. Next, select the unallocated drive to install Windows on. If there are no partitions on the disk, you will get the System Reserved partition.
    -]
    So when he says make sure that all partitions on the drive have been deleted,
    does this also mean I can't have any other spare data partitions on this same disk or I won't get a clean new System Reserved partition in addition to the Windows C: partition after installation?

    --Also at,
    Clean Install Windows 10 without DVD or USB Flash Drive
    In Kari's explanations in the part 3, Run Windows Setup from partition on same PC
    [-at 3.1 Diskpart . . . to check drive letters, and 3.2 can now launch Windows Setup from the ISO_Files folder . .-]

    After checking drive letters with diskpart, is it then required to run setup.exe from the command prompt or could one also then run it from a windows run popup?

    Also there it appears to be saying to run setup.exe in the root folder? Whereas I read somewhere else today on this forum that X: \setup.exe, is only for in-place upgrade install,
    * but running the other Setup.exe from Sources folder X:\Sources\Setup.exe allows a custom install.
    Appreciate all comments on these aspects.
      My Computer


  6. Posts : 43,412
    Win 10 Pro (22H2) (2nd PC is 22H2)
       #6

    So when he says make sure that all partitions on the drive have been deleted,
    does this also mean I can't have any other spare data partitions on this same disk or I won't get a clean new System Reserved partition in addition to the Windows C: partition after installation?
    All partitions= all partitions comprising or which have comprised the O/S. Including any remanent partitions e.g. obsolete Recovery partitions. (And the simplest and most reliable option is of course to only have the target disk in place when clean installing Win 10).

    If, for example, you had a data partition on the disk, it should be perfectly possible to keep that. You might want to consider its placement.

    Windows creates its own partitions in unallocated space, as you know.

    X: \setup.exe, is only for in-place upgrade install
    The key difference between a clean install and an in-place upgrade repair install is that the latter can only be started after having booted the PC normally.

    If you have a query related to a specific tutorial, you may be better asking the question in comments following that tutorial.
    Last edited by dalchina; 27 Jul 2023 at 23:45.
      My Computers


  7. Posts : 122
    Windows 10 Pro
       #7

    RBT said:
    Also there it appears to be saying to run setup.exe in the root folder? Whereas I read somewhere else today on this forum that X: \setup.exe, is only for in-place upgrade install
    This one is for both, as choosing "Keep nothing" cannot be considered different from custom.

    RBT said:
    * but running the other Setup.exe from Sources folder X:\Sources\Setup.exe allows a custom install.
    This one allows custom install, but custom install only. Upgrade unavailable. It allows, however, installing to another partition.
      My Computer


  8. Posts : 17,049
    Windows 10 Home x64 Version 22H2 Build 19045.4170
       #8

    RBT said:
    Below are 3 items I still need further delineation.
    You have dived into a lot of detail but do not seem to have appreciated the basic distinction between a Repair install [aka an In-place upgrade] and a Clean/Custom install.
    - Repair install [aka an In-place upgrade] is run from within Windows i.e. by booting into Windows then running the setup.exe just as you'd run any other .exe file.
    - Clean/Custom install is run by booting into the installation media.


    All the best,
    Denis
      My Computer


  9. RBT
    Posts : 54
    Windows 10 Home
    Thread Starter
       #9

    dalchina said:
    < . . . . . . >
    If you have a query related to a specific tutorial, you may be better asking the question in comments following that tutorial.
    Thanks for the replies, I will do as you said above also. Those threads were so long I thought maybe try here first. Additionally it appears I should just experiment a bit more on this with my spare computer after installing an SSD in it since it's so slow now (have done that before and it seems pretty straight forward).
      My Computer


  10. Posts : 17,049
    Windows 10 Home x64 Version 22H2 Build 19045.4170
       #10

    But do make sure you have grasped the major difference that is explained in post #8 first or you are liable to keep going round in circles.


    All the best,
    Denis
      My Computer


 

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