Can I boot Windows from an HDD via USB? inaccessible_boot_device

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  1.    12 Mar 2018 #11

    Hi,

    nunayer said: View Post
    Just used your thread to solve a problem cloning a Lenovo with UEFI.

    What worked was using Samsung's Data Migration to clone to a Samsung SATA SSD in a USB dock, then make your registry change to the copy and use a Windows 10 setup USB to repair.

    It then booted from the USB copy and I was able to use the already-installed Data Migration software to clone BACK into a newly installed Samsung M.2 SSD.

    One interesting quirk: it booted fine from the internal, but when I tried to update Windows 10 to the latest build, I got an error complaining about Windows being installed on USB.

    So I reversed the registry change, rebooted, and all's well.

    Once again ... YOU ARE THE MAN! Thank you so much!
    With all due respect that modus operandi to achieve what you wanted to achieve is really unnecessary.
    Macrium Reflect Free allows you to backup existing installs as an image and restore it to whatever drive afterwards.

    I also disagree with TS about how he created an external Windows system. It's not how that's done. It may work for a while but trouble's lurking around the corner.
    Granted, this is an oldish thread but still.

    Cheers,
      My ComputersSystem Spec

  2.    12 Mar 2018 #12

    jimbo45 said: View Post
    you can't use this method to actually boot a Windows 10 HDD from a USB unless it's a Windows to Go type of thing
    jimbo45 said: View Post
    Windows to Go needs in any case either "certified devices" or Windows Enterprise 10 to install
    fdegrove said: View Post
    There are still several software packages around that allow you to build a win to go install using any version of W7 to W10 on non-certified USB3.0 or higher devices.
    You can boot any version of Windows from any external drive. USB key, USB drive, Thunderbolt drive, SD card etc - there have been tutorials on MacForums since 2 days after they started using Intel.

    There is no voodoo about it and it is described fully by Microsoft here Windows To Go Step by Step - TechNet Articles or here Run Hyper-V Server from a USB Flash Drive

    However, if you take a drive you were already running Windows on and try to boot it from external enclosure it will not work (while if you clean install it in the same external enclosure generally it will). The reason is that all drivers aren't loaded early by the kernel as if it tried to load every single possible driver your boot would take much longer.

    If you want to boot your existing Windows install in another place (USB rather than SATA say) you may need to load those drivers earlier.

    That is the point of this thread and the procedure works.

    Thanks to both @carlossagan (OP) and @nunayer (for resurrecting it) - it helped me.
      My ComputerSystem Spec

  3.    12 Mar 2018 #13

    Hi,

    However, if you take a drive you were already running Windows on and try to boot it from external enclosure it will not work (while if you clean install it in the same external enclosure generally it will). The reason is that all drivers aren't loaded early by the kernel as if it tried to load every single possible driver your boot would take much longer.
    True but it won't be a Win to Go drive and if you go from external to internal it will likely crash or at best start a repair.
    I know you know that and so do I @lx07.

    My point being that sometimes people overcomplicate simple procedures. When you clone an internal drive to an extrnal one then you can expect trouble, right ?

    Cheers,
      My ComputersSystem Spec

  4.    12 Mar 2018 #14

    fdegrove said: View Post
    if you go from external to internal it will likely crash or at best start a repair
    I've never tried. I have installed on internal and then moved the disk to boot external many times. I think doing the opposite may just boot slower as it is loading unnecessary drivers.

    fdegrove said: View Post
    My point being that sometimes people overcomplicate simple procedures.
    Yup, I do.

    For example @Bree said the other day solitaire was better on XP than Windows 7 version I was using. Rather than looking for a simple solution (download it in 5 minutes and see) I decided I had to find a XP ISO (this takes hours), install it to a VM (more hours), find the solitaire files required and copy them to my main PC and then try it. The end result was a waste of time as the XP games don't even work well with hiDPI screens - they look tiny.

    Still - it is my hobby and I enjoyed the process :)
      My ComputerSystem Spec

  5.    12 Mar 2018 #15

    Hi,

    Still - it is my hobby and I enjoyed the process
    By all means please do.

    The original postings from TS still create a grey area though. It's all well when you know exactly what you're doing and why you're doing it for. It's not a generic solution to those who do not know nor understand it though and there sits the risk of confusion and failure.

    That said, I know well enough you have more than ample background to understand what I mean.

    Cheers,
      My ComputersSystem Spec

  6. Bree's Avatar
    Posts : 9,538
    10 Home x64 (1809) (10 Pro on 2nd pc)
       12 Mar 2018 #16

    lx07 said: View Post
    ... I decided I had to find a XP ISO (this takes hours), install it to a VM (more hours), find the solitaire files required and copy them to my main PC and then try it
    Sorry to have caused you so much work :)

    You could have saved a lot of time by just mounting the .iso (or the physical CD if you have one), look in the I386 folder and copy the compressed source files CARDS.DL_ SOL.EX_ SOL.CH_ FREECELL.EX_ FREECELL.CH_ (and any others you want) to a folder on your PC. Then open a command prompt, CD into the folder and type...

    EXPAND /R *.??_

    Surprisingly, Windows 10's EXPAND command still includes support for all of Microsoft's old compression methods.

    That's about five minutes work (sorry, again).

    PS: my laptop display is 1366x768 so they look fine.
      My ComputersSystem Spec


 
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