Windows 10: How can I install w10 in uefi mode

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  1.    09 Jan 2016 #11

    On the disk selection screen it was something like "...could not find a partition...". I have a internal SSD for the OS, an HDD for data, and the install USB stick attached at the time of installation.
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  2. essenbe's Avatar
    Posts : 11,342
    Windows 10 Pro and Windows 10 Pro Insider
       09 Jan 2016 #12

    Disconnect the Data drive, so the installer has only 1 option. If the SSD shows unallocated, in advanced options click 'NEW" and the installer should create the required partitions. If you are showing any partitions on the SSD, in advanced options delete all partitions until it says unallocated, then click New. See if this helps

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  3. Berk's Avatar
    Posts : 14
    Windows 10, Windows 7, Linux Mint 17.3
       09 Jan 2016 #13

    topgundcp said: View Post
    A normal, fresh install of Windows 10 will have 4 partitions, not 3:
    1. 450MB Recovery partition (Tools for trouble shooting, Reset, Refresh, diagnistics ...)
    2. 100MB EFI FAT32 System partition (Boot code. Without it, Windows won't boot)
    3. 16MB MSR (Microsoft Reserved partition for use with GPT disk type)
    4. C Drive
    topgundcp said: View Post
    I am amazed that Macrium put this article in their knowledge base...

    ...As you can see. #1 was ommited by the article. That means there's no way to create a Recovery disk. In addtition, The sizes of EFI and MSR partitions are wrong.
    Hi, I hate to the new guy splitting hairs, but as far as I can tell the sizes of the recovery, EFI boot and MSR partitions are non critical, provided they are large enough. Although I would recommend the standard set-up for single OS systems.

    • The partition order seems to be the critical issue.
    • Diskpart (convert gpt command) and Windows Disk Management users need to be aware that these tools always silently create an unnecessary 128MB MSR partition when a fresh GPT disk is initialised.
    • I would treat 450MB, 100MB and 16MB as the absolute minimum recommended as this is how Windows 10 installer creates them.
    • For multi-boot users it may be advisable to make that EFI boot partition larger, say 150MB-200MB*

    *I have set up my system with a larger EFI and neither Windows 7 nor Windows 10 installers complained. Everything boots correctly, although I have an issue with Windows 10 reporting nonsense in settings -> storage (I doubt it's due to the EFI partition size, but in the interests of full disclosure I ought to say my system is not yet perfect)

    • There is apparently no need to deviate from 16MB for the MSR partition regardless of disk capacity, even though other sizes will work. I have read that this partition is only used by BitLocker, although I would like to find some confirmation.

    I would however like to know how the Recovery partition is used by multi-boot systems? i.e. will it be used by Windows 7, 8 or 8.1 if they are installed alongside Windows 10? in which case is it prudent to make a >900MB or greater recovery partition?
    Last edited by Berk; 09 Jan 2016 at 13:02.
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