Windows 10: Changing from Legacy Bios to UEFI, settings in bios and Windows 10 Solved

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  1.    3 Weeks Ago #1

    Changing from Legacy Bios to UEFI, settings in bios and Windows 10

    I used the Windows converting program MBR2GPT.exe to convert my SSD to GPT and it reported it had done it. I then rebooted and entered the bios and changed one setting from Legacy ROM to EFI Compatible ROM and another setting called 'UEFI Boot' from Disabled to Enabled and saved. When I booted nothing happened, it was like it saw nothing was connected to the MB and I had to clear the bios and put my cloned drive I did not change to GPT back in. Not sure what I need to do the get it to work? I have other drives in the system too: another SSD and two HDDs in RAID. Do I need to change them also to GPT? They are just for storage.

    Thanks for the help in advance.
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  2. Caledon Ken's Avatar
    Posts : 9,860
    Windows 10 Pro x64 Build 1803
       3 Weeks Ago #2

    Morning radman3d. Welcome to the TenForums @radman3d

    GPT is just one element. You need an EFI partition. See my disk layout on disk 2.

    Click image for larger version. 

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    What are you trying to achieve by changing your boot?

    Right click on start, click disk management and look at your boot disk.
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  3.    3 Weeks Ago #3

    I have read that EFI is faster when booting up from a cold boot. Granted my machine is fast, only 60 seconds and I'm booted with Legacy Bios. And I just thought I would give it a try if it is not too much trouble and I do not have to reinstall windows. I do wonder how well UEFI will work on my old Biostar TZ68K+. It has the settings in the bios as I stated above, but I really do not know what I am doing and would like to learn more about UEFI. As I also stated it seemed as if the MB was dead when I switched, like it never even looked for a SSD.
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  4. Caledon Ken's Avatar
    Posts : 9,860
    Windows 10 Pro x64 Build 1803
       3 Weeks Ago #4

    I really don't think you will see much difference.

    There is pretty common mis-understanding out there.... a cold boot, unless you disable Windows Fast Startup, is not fresh copy of Windows, "Cold".

    Turn On or Off Fast Startup in Windows 10

    As a test hold the shift key down and click shutdown. Holding the shift down and clicking shutdown bypasses Fast Startup for a single boot.

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  5.    3 Weeks Ago #5

    I guess I will not bother with UEFI until I upgrade/build a new system. Thanks for the help Ken.
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  6. Caledon Ken's Avatar
    Posts : 9,860
    Windows 10 Pro x64 Build 1803
       3 Weeks Ago #6

    Did you try holding down shift and shutdown. You will likely see a better "Cold boot.
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  7.    3 Weeks Ago #7

    Sorry, yes I did and there was hardly any difference, maybe a few seconds. The main thing is from the time I turn it on until it starts booting windows is a good 15 seconds. I do think UEFI might be faster than Bios for that part.
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  8. Caledon Ken's Avatar
    Posts : 9,860
    Windows 10 Pro x64 Build 1803
       2 Weeks Ago #8

    I'm sure there is a way to switch by doing this and or that but have you considered a clean install. Yes more work but a good base to move forward on.
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  9.    2 Weeks Ago #9

    Hi there

    can easily be done without losing data or need a quick install.

    step 0 ) before starting create bootable copy of KYHI's disk on USB - download iso and use rufus to make bootable

    1) in admin mode type disk part
    2) list disk
    3) select disk xx (the target disk for your OS)
    4) convert gpt
    5) create partition efi size=100
    6) format quick fs=fat32 (EFI partition)
    7) create partition primary
    8) format quick fs=ntfs (partition for OS - you can resize later if you don't need to use whole disk).

    7) shut down windows and boot KYHI's disk (usb you created step 0)

    8) start aomi partitition assistant (on the disk) and copy the C partition to C partition on your target drive.

    9) now start macrium (a;so on the KYHI disk) and choose fix windows boot problems

    10) choose the installation on the target disk

    11) shutdown and re-boot new system.

    12) check though in BIOS you boot from correct HDD and also UEFI enabled --forget secure boot you don't want or need that.

    You might one more time if boot fails need to boot into KYHI's disk and re-run the Macrium fix windows boot problems - again choose the correct windows installation from the right disk.

    All done -- Q.E.D

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  10. Caledon Ken's Avatar
    Posts : 9,860
    Windows 10 Pro x64 Build 1803
       2 Weeks Ago #10

    By admin mode you mean command prompt(admin) or powershell (admin) and disk part should be one word diskpart.

    jimbo what does step 8 do? (Always learning.)
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