Windows 10: EFI partition missing

Discus and support EFI partition missing in Windows 10 Installation and Upgrade to solve the problem; I bought a new SSD and did a clean installation of Windows 10 on the new drive, but i'm still keeping my old HDD into my laptop as a secondary drive.... Discussion in 'Windows 10 Installation and Upgrade' started by SalvatoreCS, Jan 2, 2019.

  1. EFI partition missing


    I bought a new SSD and did a clean installation of Windows 10 on the new drive, but i'm still keeping my old HDD into my laptop as a secondary drive.

    After the installation worked (the laptop was working correctly) I decided to format my old HDD. After a reboot i got this message "default boot device missing, select a new boot device" but in the list there isn't any any element to choose. I booted from USB and checked with DISKPART from Prompt and there isn't any EFI partition in the SSD. I even tried with bootrec but it says "access denied" and the boot recovery tool isn't working either. My laptop can't boot and I can only use prompt. Can anybody help me?

    :)
     
    SalvatoreCS, Jan 2, 2019
    #1
  2. trog100 Win User

    Move EFI partition

    its to enable win 10 to update to its anniversary edition.. it cant do this due to lack of C drive space i have had a quick try with the trial version of easus.. it didnt seem to be able to do what i want..

    i am assuming i cant just delete the efi partition but maybe i could.. as yet i havnt even figured out how to get into the bios of the thing.. maybe that should be my next step.. *Smile EFI partition missing :)

    diskpart could probably do it but figuring out how (it aint that user friendly) might be difficult without step by step instructions..

    trog
     
    trog100, Jan 2, 2019
    #2
  3. Suvrat18 Win User
    Blank EFI Partition

    I have an ASUS R558UR.

    I had windows 10 installed on my laptop and I decided to again have a clean install of windows 10. I booted from USB and cleaned windows partition i.e. C drive and also cleaned EFI partition. I reformatted Drive and it had also created EFI partition of 100
    MB. I installed windows on laptop and setted that up. After installing windows my laptop it started taking a long time to boot about 90 seconds but earlier it took only 7-10 seconds. After analysing everything I found that my EFI partition is blank.

    Please suggest me how to write back EFI partition so as to reduce boot times.

    Thanks in Advace.
     
    Suvrat18, Jan 2, 2019
    #3
  4. Saltgrass Win User

    EFI partition missing

    UNMOUNTABLE_BOOT_VOLUME after creating new EFI System Partition

    I would probably have booted to a Windows install or recovery media to create the

    EFI system partition by using Diskpart and the create par efi command with any modifiers necessary to make it fit in the correct location.

    I know Linux can use a Microsoft EFI partition but I do know if Windows can use a Linux version.

    Yes, the bcd listing which shows the boot manager and OS loader.

    It may have been easier to use a third party partition manager to change the size of the EFI partition.

    If you might need it, here are the details of an EFI partition from Diskpart.

    Partition 2

    Type : c12a7328-f81f-11d2-ba4b-00a0c93ec93b

    Hidden : Yes

    Required: No

    Attrib : 0X8000000000000000

    Offset in Bytes: 524288000

    Volume ### Ltr Label Fs Type Size Status Info

    ---------- --- ----------- ----- ---------- ------- --------- --------

    * Volume 3 FAT32 Partition 99 MB Healthy System
     
    Saltgrass, Jan 2, 2019
    #4
Thema:

EFI partition missing

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