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Efi system partition creation on Windows 10 install

Anonymous
2020-11-06T00:29:07+00:00

Hello everyone.

I want to install Windows 10 on an SSD (GPT drive) and I have already failed it in a way.

The thing is that if there is no EFI partition on a disk (it doesn't have any partitions at all), the windows installer won't create the 100 mb efi partition when I choose the disk, thus it won't boot up, as it has no efi partition.

Making the disk gpt again via diskpart has no effect.

(select disk 1

clean

convert gpt

exit)

What has an effect though is creating a efi partition.

(create partition efi size=100

format quick fs=fat32)

But the problem is that after that windows automatically creates another 100 mb efi partition, so there are 2 of them.

I would have tried just installing that, but something tells me that this won't work.

I hope some of you actually encountered such situation and you can tell me how to deal with it.

Thanks in advance.

Windows for home | Windows 10 | Install and upgrade

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  1. Anonymous
    2020-11-06T12:59:24+00:00

    If you want an independent install of Win 10, you need to disconnect the other drive.  If you want to use the current EFI system partition, it will do that but if that drive were to fail you would not be able to boot Win 10.

    Switching places with the drives will not make a difference..

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  1. Anonymous
    2020-11-06T12:13:47+00:00

    You stated it was creating a second EFI partition.  Clean the drive and then install.  Make sure you are booting the Install Media in the UEFI configuration..

    Having another drive attached while installing can cause situations with where partitions are placed..  If you already have a EFI system partition on another drive, it will be used for the new install..

    Your description of the partitions is correct except the Recovery Tools partition is variable but usually 450 MBs or larger..

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  1. Anonymous
    2020-11-06T09:31:41+00:00

    Win 10 has 4 critical partitions it creates with a new install.  I you are using a clean drive, just give the unallocated space you want to use and it will convert the drive an install the correct partitions.  If you had already created the System EFI partition, it would probably make a new one in the unallocated space.

    You can manually create all the partitions and Win 10 will install using those.

    Critical partitions are Recovery Tools, EFI, MSR. and OS..

    "it will convert the drive and install the correct partitions"

    That's exactly what the problem is. On an empty disk it doesn't create the efi system partition. And if you have one it creates another one for some reason.

    And what are the specs for other partitions (except OS)? I know MSR is 16MB, EFI is 100 and FAT32, but what about recovery size and type and MSR type?

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  2. Anonymous
    2020-11-06T05:30:05+00:00

    Win 10 has 4 critical partitions it creates with a new install.  I you are using a clean drive, just give the unallocated space you want to use and it will convert the drive an install the correct partitions.  If you had already created the System EFI partition, it would probably make a new one in the unallocated space.

    You can manually create all the partitions and Win 10 will install using those.

    Critical partitions are Recovery Tools, EFI, MSR. and OS..

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  3. Anonymous
    2020-11-06T00:40:54+00:00

    Hello how are you?

    Thank you for contacting the Microsoft Community.

    My name is Lílian I am an independent consultant and I am very happy to help you today.

    We recommend running Windows:registered: 10 installations by enabling UEFI with a GUID Partition Table (GPT).

    Configure a system to install an OS on a GUID Partition Table (GPT) partition

    1- Connect a Windows 10 USB installation key to UEFI.

    2- Boot the system into the BIOS (for example, using F2 or the Delete key).

    3- Locate the Startup Options menu.

    4- Set the Start CSM option to Enabled. If CSM is Disabled, you can skip step 8 below.

    5- Set the Boot Device Control to UEFI Only.

    6- Adjust Startup from Storage Devices for UEFI driver first.

    7- Save your changes and restart the system.

    8- Restart the BIOS (for example, using F2 or the Delete key).

    9- Confirm in the Boot Priority List that the OS Boot option by UEFI USB is at the top of the list.

    10- start the system and install Windows as usual.

    If I helped you in any way, put it as resolved.

    Please participate in the evaluations.

    Lilian!

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