USB Installer UEFI or Not?

Page 1 of 2 12 LastLast
  1. FunkMaster's Avatar
    Posts : 159
    Windows 10 Home
       #1

    USB Installer UEFI or Not? SOLVED


    Hey guys, I'm not so organized due to my health. I have multiple Windows 10 Installers, Linux etc, and usually choose to download the iso and create my own USB Installers, and usually label them appropriately. I have this one that I'm not sure if it was installed as UEFI, is there a way to tell without going through reinstalling it to the USB again?

    Don't know if you can tell by looking at the contents but here they are:

    05/22/2018 02:24 PM <DIR> boot
    05/22/2018 02:24 PM <DIR> efi
    05/22/2018 02:24 PM <DIR> sources
    05/22/2018 02:36 PM <DIR> support
    05/22/2018 02:36 PM 128 autorun.inf
    05/22/2018 02:36 PM 407,582 bootmgr
    05/22/2018 02:36 PM 1,257,376 bootmgr.efi
    05/22/2018 02:36 PM 80,648 setup.exe
    4 File(s) 1,745,734 bytes
    4 Dir(s) 12,275,924,992 bytes free

    Thanks, FM
    Last edited by FunkMaster; 11 Sep 2018 at 10:49.
      My ComputerSystem Spec

  2. topgundcp's Avatar
    Posts : 2,447
    Ubuntu14.04x64 MintMate17x64 Win10Prox64
       #2

    The installer will install either UEFI (GPT) or MBR depending on how you set in the BIOS.

    If you want to install with GPT then set the BIOS to UEFI boot mode or Disable CSM, set Boot priority to UEFI-USBXXX
    If you want to install with MBR then set the BIOS to Legacy boot mode or enable CSM, set Boot priority to USB-XXX for MBR

    If using Boot Menu for one time boot, select UEFI-USBXXX for GPT, USBXXX for MBR.

    To tell if Windows was installed with UEFI (GPT). Open Disk Management (Win+X->Disk Management)
    If the layout is: 499 MB Recovery, 100 MB EFI System and C drive then it is GPT.

    If the Layout is: 549MB System Reserved and C drive then it is MBR.
      My ComputerSystem Spec

  3. FunkMaster's Avatar
    Posts : 159
    Windows 10 Home
    Thread Starter
       #3

    Wow, that's a great answer topgundcp! I didn't know that, I always thought the Medium had to be created as UEFI for UEFI Install.

    If using Boot Menu for one time boot, select UEFI-USBXXX for GPT, USBXXX for MBR.
    But will the USB show up as UEFI when NOT CREATED as UEFI? I assume so as you are telling me that, just want to be clear in my mind. I understand it needs to be set that way in the BIOS, but the above question would still be interesting to me.

    Thanks, FM
      My ComputerSystem Spec

  4. NavyLCDR's Avatar
    Posts : 11,829
    Windows 10 LTSC
       #4

    Is the USB flash drive partitioned as MBR or GPT. If it is MBR it is possible to boot both legacy BIOS and UEFI. If it is GPT then it is UEFI only.

    Is the partition on the USB FAT32 or NTFS? If FAT32, it is possible to boot both legacy BIOS and UEFI. If NTFS, likely to boot in only legacy BIOS.

    Is the partition marked as active? If the partition is not marked as active, then it will not not boot in legacy BIOS.

    What you want for a universal USB flash drive is MBR partitioned with a Fat32 partition that is marked as active.
      My ComputerSystem Spec

  5. FunkMaster's Avatar
    Posts : 159
    Windows 10 Home
    Thread Starter
       #5

    Wow, this is getting even more interesting Navy!

    It is GPT, and it is FAT32, so that explains a lot. Because I tried to boot it on a few legacy BIOS Machines, and of course it would not boot, and I was suspicious at the time it was just what we are discussing here.

    It doesn't look to be Marked as Active, is that because it was formatted as GPT?

    USB Installer UEFI or Not?-w10-1803-disk-management.png

    What you want for a universal USB flash drive is MBR partitioned with a Fat32 partition that is marked as active.
    Okay, I generally use Rufus, so just make those choices during the install choices right, all fairly obvious right?

    When ever I run into an issue like this and I can't solve it I'll break out the DVD LOL, but that don't allow me to learn now does it LOL.

    Thanks man, this is some cool stuff!
      My ComputerSystem Spec

  6. NavyLCDR's Avatar
    Posts : 11,829
    Windows 10 LTSC
       #6

    You can't set partitions as active with GPT type partitioning. I can't remember the exact settings in RUFUS because I don't use it. It is something like MBR partitions for legacy BIOS and UEFI. And then make sure FAT32 is selected. Then before hitting the OK button go back and look at the settings again and make sure none of them have changed.

    The way I make a Windows installation flash drive is with diskpart. With the USB flash drive inserted, open a command prompt or powershell window and run:

    diskpart <-answer the administrator prompt if you get one.
    list disk
    select disk # <-replace # with the actual number of the USB flash drive
    clean <-this will erase the drive selected above, make sure it is the USB flash drive!
    create part pri
    format fs=fat32 quick
    active
    assign
    exit
    exit

    Then mount the Windows ISO file and copy all the files and folders from the mounted ISO file to the newly formatted USB flash drive. Windows 8 and Windows 10 will both mount ISO files from file explorer. Windows 7 requires a separate program to mount ISO files such as WinCDEmu:
    WinCDEmu - the easiest way to mount an ISO. And more....

    Once you've done it enough times to memorize the commands you can have the flash drive ready to go in less time than it takes you to load RUFUS.

    Or - if you don't have an ISO file saved, just let Microsoft's Media Creation Tool create the flash drive for you:
    Download Windows 10 Disc Image (ISO File)
      My ComputerSystem Spec


  7. Bree's Avatar
    Posts : 12,493
    10 Home x64 (1903) (10 Pro on 2nd pc)
       #7

    FunkMaster said: View Post
    It is GPT, and it is FAT32, so that explains a lot...
    NavyLCDR said: View Post
    The way I make a Windows installation flash drive is with diskpart...
    Then mount the Windows ISO file and copy all the files and folders from the mounted ISO file to the newly formatted USB flash drive...
    Yes, I find Diskpart and copying the files the easiest and most reliable method.

    In this case you may not even need the ISO, you could copy the files from your gpt-formatted usb. It looks like it has all the legacy files on it, even if it can't boot them because it's gpt.
      My ComputersSystem Spec

  8. FunkMaster's Avatar
    Posts : 159
    Windows 10 Home
    Thread Starter
       #8

    Thanks for those nice little commands, I'll try it!

    Or - if you don't have an ISO file saved, just let Microsoft's Media Creation Tool create the flash drive for you:
    I never do it that way, so I really appreciate the instructions using cmd! I always download iso's and keep them around. I think I have all since 1511, and most of the Windows Lineup, I'm a Hoarder LOL.

    I've found when you use MCT the Installer actually has some negative effects, to me at least.

    Thanks Bree!!!
      My ComputerSystem Spec

  9. FunkMaster's Avatar
    Posts : 159
    Windows 10 Home
    Thread Starter
       #9

    I finally found this: Create Bootable USB Flash Drive to Install Windows 10, so will do it this way and test it out. Hybrid saves me another USB Drive, and I'm getting crazy with so many drives around LOL.

    I kept all the info on how to do this manually and will try that later also.

    Thanks
      My ComputerSystem Spec

  10. FunkMaster's Avatar
    Posts : 159
    Windows 10 Home
    Thread Starter
       #10

    @NavyLCDR and Bree, thanks for the suggestions. I did use the commands Navy, had a few hiccups but all went well eventually. I used them to create a Hybrid Linux USB also.

    Thanks
      My ComputerSystem Spec


 
Page 1 of 2 12 LastLast

Related Threads
My netbook is DENVER NBW-10004N. It was running Windows 10 64-bit but the boot file was corrupted so i had to format and install clean Windows 10 32-bit. Now i got another problems. Audio driver is not working, battery icon not showing and...
Sometime in the fall I started getting Windows 10 update errors trying to install 1607 (the anniversary update I believe). After trying different fixes I just ignored it for a while hoping windows would come up with a fix. 6 months later and I'd...
I want to enable UEFI with Secure Boot and I do have an option to enable Secure Boot. But how can I tell if I am running UEFI firmware version 2.3.1.c ? Because to enable Secure Boot, machines must have UEFI firmware version 2.3.1.c I went to...
Hello. So i got automatic repair after changing boot order from UEFI USB KINGSTON to P1 Samsung SSD 840 EVO. I am able to get through to Windows 10 but after restart after automatic repair. So i am needing 2 boots now. Screen: 74243 And my...
Source: UEFI ForumAnnounces the Availability of Updated Specifications: UEFI v2.6 and ACPI v6.1 | Business Wire
Our Sites
Site Links
About Us
Windows 10 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 10" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd
All times are GMT -5. The time now is 20:33.
Find Us