Windows 10: Disk Boot Failure, Attempting to restore EFI partition

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  1.    09 Jun 2017 #1

    Disk Boot Failure, Attempting to restore EFI partition


    Had a power loss and while I have my workstation on a battery backup I on impulse just killed the power to my PC instead of doing a proper shutdown. I had just completed a steam game installation at this point (Mafia III, not sure if this is relevant though).

    Long story short, upon reboot, I experienced the following:

    Click image for larger version. 

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    (Disk Boot Failure)

    I loaded up a recovery USB and attempted a repair to no avail. From the command prompt I ran CHKDSK and DISKPART and got the following:

    Click image for larger version. 

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ID:	138641Click image for larger version. 

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    CHKDSK seems to indicate that my actual Win10 partition is still there but for some reason I don't see an EFI partition to boot into it. I'd like to see if restoring this partition gets me back my installation. I can go through a reinstall if need be but it will be an enormous pain and I will likely lose some important info as well.

    How do I go about restoring my EFI partition?

    For reference, the boot disk is a Samsung SSD 850; it's less than a couple years old and given that it was behind a battery when I lost power (not a surge, just accidentally flicked the wrong breaker) I'm surprised that it would fail in this manner.

    Any advice would be much appreciated!
      My ComputerSystem Spec

  2.    09 Jun 2017 #2

    Hi, I'll assume you haven't yet discovered the value of disk imaging, which would have let you resolve this quickly without technical help. If so, I would recommend you start using this routinely when this is hopefully resolved.

    1. First please download and create Kyhi's boot disk (DVD/USB disk) from the top of the Software and Apps section here.

    Boot your PC from this, run Minitool Partition Manager and post a screenshot.

    2. Using the same disk, run Macrium Reflect, and use its Fix Boot utility to attempt to resolve your boot problem

    3. Assuming your Windows partition is intact, there is a way to rescue this using a Win 10 install disk and Macrium Reflect.
    Try the above first.
      My ComputerSystem Spec


  3. Posts : 16,251
    windows 10 professional version 1607 build 14393.969 64 bit
       09 Jun 2017 #3

    Do you have a bootable DVD, CD or USB?
    If you have a flash drive that you can format create a windows 10 bootable iso.
    You have a custom computer and will likely need to modify the bios boot order to boot to the USB.
    If there is an F key then you can boot to the USB without changing the boot order.
      My ComputerSystem Spec

  4.    09 Jun 2017 #4

    zbook said: View Post
    Do you have a bootable DVD, CD or USB?
    If you have a flash drive that you can format create a windows 10 bootable iso.
    You have a custom computer and will likely need to modify the bios boot order to boot to the USB.
    If there is an F key then you can boot to the USB without changing the boot order.
    I am booting into my workstation using the Windows Recovery USB. I've already verified the boot order in my BIOS.
      My ComputerSystem Spec

  5.    09 Jun 2017 #5

    If your partition has disappeared - and without an answer to my previous post I will simply assume it has: you can

    a. Create a disk image of your Windows partition (on an external disk) using e.g. Macrium Reflect (free).
    b. Reinstall Win 10 on your system disk, erasing all existing partitions related to the Windows OS (keep any data ones)
    c. Replace the newly created Windows partition by restoring yours from the image
    d. Run Startup Repair from your Win 10 boot disk.
      My ComputerSystem Spec

  6.    09 Jun 2017 #6

    I would highly recommend you do as @dalchina suggested and boot the computer from Kyhi's Recovery Tools and see what the diagnostic tools on his recovery tools can do to fix the drive - you need to look specifically at partition recovery programs. From the screenshots the only partition you have on the drive is the 450MB Windows 10 recovery partition at the very end of the drive. You need to do more than create an EFI partition or "Fix Windows boot problems", you need to recover the Windows partition, if possible.
      My ComputerSystem Spec

  7.    12 Jun 2017 #7

    dalchina said: View Post
    If your partition has disappeared - and without an answer to my previous post I will simply assume it has: you can

    a. Create a disk image of your Windows partition (on an external disk) using e.g. Macrium Reflect (free).
    b. Reinstall Win 10 on your system disk, erasing all existing partitions related to the Windows OS (keep any data ones)
    c. Replace the newly created Windows partition by restoring yours from the image
    d. Run Startup Repair from your Win 10 boot disk.
    Apologies for the delay in this response, I will be running the steps in your previous post as well as this tonight - I decided to order (and had to wait for Amazon to deliver) a set of 16GB USB drives so I don't have to keep reflashing my pair of 8GB drives (one with Win10 recovery, one with Memtest) every time I need a new tool.

    I'll post my results once I'm complete.
      My ComputerSystem Spec

  •    21 Jun 2017 #8

    So I've attempted the steps @dalchina suggested but it seems that Macrium Reflect can no longer "see" my Windows partition on my SSD drive. I am able to run Power Disk Recovery (should I be using something different?) and find what looks to be my Windows partition but I'm not sure if this is the best way to go about restoring my original boot partition - if indeed this is even advisable.

    Is there a better way to rescue my old Win10 boot partition?

    I'm also considering RMA'ing my SSD drive but would like to run a diagnostic on the drive itself first...

    Is there a utility on Kyhi's Recovery Disk (HDDScan?) that will do this?
      My ComputerSystem Spec

  •    22 Jun 2017 #9

    Hi, regarding your partition structure- or what may be left of it- we're still waiting for a response to the following info (see #2)
    - which is relevant as you say
    Macrium Reflect can no longer "see" my Windows partition on my SSD drive
    1. First please download and create Kyhi's boot disk (DVD/USB disk) from the top of the Software and Apps section here.

    Boot your PC from this, run Minitool Partition Manager and post a screenshot.
    to post a screenshot please use the Insert Image icon above your post to the left of the video icon

    2.
    would like to run a diagnostic on the drive itself first...
    Is there a utility on Kyhi's Recovery Disk (HDDScan?) that will do this?
    HD Tune, HDDScan
    Note e.g. surface checks are available.

    3.
    Lazesoft Recovery is on the disk too- Someone has used that successfully to effect a repair- I'm not familiar with it myself.Please feel free to explore it.

    Note: most partition recovery programs are not free.
      My ComputerSystem Spec

  •    26 Jun 2017 #10

    @dalchina: Thanks for your help & advice. The following are my results.

    dalchina said: View Post
    Hi, regarding your partition structure- or what may be left of it- we're still waiting for a response to the following info (see #2)
    - which is relevant as you say

    1. First please download and create Kyhi's boot disk (DVD/USB disk) from the top of the Software and Apps section here.

    Boot your PC from this, run Minitool Partition Manager and post a screenshot.
    to post a screenshot please use the Insert Image icon above your post to the left of the video icon

    Click image for larger version. 

Name:	MinitoolPartitionManagerScreenshot1.PNG 
Views:	4 
Size:	390.6 KB 
ID:	141295Click image for larger version. 

Name:	MinitoolPartitionManagerScreenshot2.PNG 
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Size:	128.8 KB 
ID:	141296

    These are snips from the same screen - I have a RAID 5 array (data partition, the SSD is my boot partition) running off the motherboard and Minitool is seeing each drive individually (which creates a list too long for a single screenshot.) I created a second screenshot with the drive/partition menus scrolled down.

    2.
    HD Tune, HDDScan
    Note e.g. surface checks are available.

    Click image for larger version. 

Name:	HDTuneErrorScan.PNG 
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Size:	20.9 KB 
ID:	141297Click image for larger version. 

Name:	MinitoolPowerDataRecovery-LostPartitonRecovery.PNG 
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Size:	65.3 KB 
ID:	141298

    I wasn't able to get HDScan to work - I can get the surface/read test to execute, however, I get an exception when I attempt to pull a report.

    HDTune seems to work a bit better; the first snip above seems to indicate that my drive is healthy, although, I'm a bit hesitant to accept this since my boot partition did legitimately vanish.

    The latter screenshot is of my results from Minitool Power Data Recovery, I can post the .rss file itself here as well if that would be helpful. From what I can interpret here there is still recoverable data on my drive.


    3. Lazesoft Recovery is on the disk too- Someone has used that successfully to effect a repair- I'm not familiar with it myself.Please feel free to explore it.

    I can take a shot at this - but I want to make sure that I have recovered any info from my drive before I attempt to repair it (again, I did attempt a Win10 repair when I first lost the partition so maybe I am hosed regardless).

    Note: most partition recovery programs are not free.
    I have set up an RMA with Samsung and am inclined to get the SSD replaced once I have recovered everything possible - even if the drive appears healthy it doesn't seem like I should spontaneously lose my partition due to simple a power loss (no surge, I have the PC on a battery backup, I flipped the breakers and killed the power to the PC once I realized it was on battery)?
    Last edited by monikersupreme; 26 Jun 2017 at 13:59. Reason: clarification
      My ComputerSystem Spec


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