Windows 10: Windows won't boot in UEFI mode, deleted EFI partition. Solved

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  1.    25 Aug 2015 #11

    OnePlus said: View Post
    the laptop actually came with Windows 8 installed and i wiped the hard drive and upgraded to Windows 10 afterwards. So at this point, i imagine the hard drive would possibly have been in the same condition as it is now, without the EFI partition, but i can't quite remember how i wiped it that time.
    Have you ever actually upgraded the original Windows 8 to Windows 10 from inside Windows 8? If you did not, was your Windows 10 activated? Are you trying to use the free Windows 10 upgrade? You might be trying to do all this only to end up with a Windows 10 that won't activate.
      My ComputerSystem Spec


  2. Posts : 1,837
    Windows 3.1 to Windows 10
       25 Aug 2015 #12

    the issue you are having - is because when you did the New installation of windows 10 on your New (second) SDD

    The new installation place the boot record on the old EFI Partition (which has been deleted)

    You must shrink one of the partitions on the New SSD by 228MB and recreate an EFI partition

    and will have to also have to recreate the the MS Reserved partition
    Then write the boot files to the new EFI partition

    Actually you are way better off, just unplugging the OLD HDD and doing a clean Installaion of windows 10 on the New SDD

    then plugin the Old HDD for use as a second DATA drive
      My ComputerSystem Spec

  3.    25 Aug 2015 #13

    Kyhi said: View Post
    the issue you are having - is because when you did the New installation of windows 10 on your New (second) SDD

    The new installation place the boot record on the old EFI Partition (which has been deleted)

    You must shrink one of the partition on the New SSD and add an EFI partition
    Then write the boot files to the new EFI partition

    I would also Bet you will have to also have to recreate the the MS Reserved partition
    Yeah, this is what i tried to do earlier but didn't have much success. The problem i had with this was, i needed the SSD to be GPT for UEFI to work, but in order to copy the boot files an installation of Windows already had to be installed.

    I installed Windows onto my SSD and attempted to copy the boot files to an EFI partition that i had created on the normal hard drive but this didn't seem to work. Maybe if i do it the other way around like you say, then it would be okay.

    It's difficult though because i have little experience with using DiskPart to create these setups. Last time i followed this tutorial, but i found it a bit difficult to adapt to my current situation. I'm well outside of my comfort zone with this stuff.

    Windows 8 can't start due to missing EFI partition.

      My ComputerSystem Spec


  4. Posts : 1,837
    Windows 3.1 to Windows 10
       25 Aug 2015 #14

    Actually you are way better off, just unplugging the OLD HDD and doing a clean Installaion of windows 10 on the New SDD

    then plugin the Old HDD for use as a second DATA drive
      My ComputerSystem Spec

  5.    25 Aug 2015 #15

    Kyhi said: View Post
    Actually you are way better off, just unplugging the OLD HDD and doing a clean Installaion of windows 10 on the New SDD

    then plugin the Old HDD for use as a second DATA drive
    That's probably the best option, because i'm really fed up with this problem now. It's just a bit difficult to remove the hard drive on this laptop, and very time consuming as well.
      My ComputerSystem Spec

  6.    25 Aug 2015 #16

    OnePlus said: View Post
    That's probably the best option, because i'm tired of this problem now. It's just a bit difficult to remove the hard drive on this laptop, and very time consuming as well.
    Haven't done this in a while, but can't you just disable the second HDD through the BIOS? Normally, it is set to auto detect, I think. Switching this to Disabled should do the trick. But as I said, haven't done this in a long time.
      My ComputerSystem Spec

  7.    25 Aug 2015 #17

    Rudy Mas said: View Post
    Haven't done this in a while, but can't you just disable the second HDD through the BIOS? Normally, it is set to auto detect, I think. Switching this to Disabled should do the trick. But as I said, haven't done this in a long time.
    Haha, i changed the wording of my message since you quoted me. That's a good point, i did think about doing this earlier but almost forgot. I will have a look and see whether there's an option, but unfortunately this is a laptop BIOS and usually they can be quite limited with the functionality.
      My ComputerSystem Spec

  8.    25 Aug 2015 #18

    Rudy Mas said: View Post
    That doesn't work. You need to choose "GPT partition scheme for UEFI" and formatting in FAT32.

    The one you made, will only boot in Legacy mode.
    Exactly you are right. I also did the same and installed windows 10 as a clean install and now i am enjoying with uefi native mode. Yes when you create bootable setup in flash drive you use gpt partition scheme for uefi. But before doing to install for the first time either delete the whole hardisk partition from the same wizard where you partitions while installing and create new ones according to ur needs. But what i did when i first saw the screen install now for windows 10. I chose repair this pc and somehow i managed to get into command prompt and used the diskpart program. I am sure you aware of this. In which you just use these 3 commans . List disk . Select disk # . Clean . Convert gpt . These 4 commands convert your partition table from mbr into gpt and that then you exit and install it from the start again as normal. Its that simple
      My ComputerSystem Spec

  9.    25 Aug 2015 #19

    Does your laptop came with windows 10 oem preinstalled??
      My ComputerSystem Spec


  10. Posts : 1,837
    Windows 3.1 to Windows 10
       25 Aug 2015 #20

    Here lies another issue > stop using RUFUS
    MS does not use RUFUS..

    MS setup media will boot Legacy and UEFI depending on the PC's Firmware settings
    Most Newer PC's boot UEFI by default

    The issue comes from having legacy support enabled in the Firmware and you selecting the WRONG USB boot Mode from the Boot menu
      My ComputerSystem Spec


 
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