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Q: [Help] Can't boot to windows (8.1) after resizing partition

Hi

 

Need some urgent help here actually!

I am currently using osx el capitan and have a boot camp partition (windows 8.1). Tried to repartition it just now and it was successful but I tried to reboot up to windows but cant reboot?

 

Anyhelp??

 

Thanks!

Posted on Jan 5, 2016 5:59 AM

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Q: [Help] Can't boot to windows (8.1) after resizing partition

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  • by Dinh Duc Hiep,

    Dinh Duc Hiep Dinh Duc Hiep Mar 28, 2016 2:36 AM in response to Loner T
    Level 1 (4 points)
    Mar 28, 2016 2:36 AM in response to Loner T

    Hi Loner T,

    I got the same issue and followed all of your instruction but I can't boot Window. It always report that I need to repair system with error code 0xc000000e.

    1. I disabled SIP as your advice

    2. I followed your instruction and the log as follows:

     

    Last login: Mon Mar 28 16:12:04 on ttys000

    Dinhs-MacBook-Pro-2:~ dinhduchiep$ diskutil list

    /dev/disk0 (internal, physical):

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *121.3 GB   disk0

       1:                        EFI EFI                     209.7 MB   disk0s1

       2:          Apple_CoreStorage Macintosh HD            57.0 GB    disk0s2

       3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

       4:       Microsoft Basic Data Work                    29.2 GB    disk0s4

       5:       Microsoft Basic Data Win10                   34.1 GB    disk0s5

    /dev/disk1 (internal, virtual):

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                  Apple_HFS Macintosh HD           +56.7 GB    disk1

                                     Logical Volume on disk0s2

                                     845A76A1-FDBD-4E36-AFDD-A5A62380E3AF

                                     Unencrypted

    Dinhs-MacBook-Pro-2:~ dinhduchiep$ diskutil cs list

    CoreStorage logical volume groups (1 found)

    |

    +-- Logical Volume Group 1364E43B-7F66-4746-90B4-58F73385F264

        =========================================================

        Name:         Macintosh HD

        Status:       Online

        Size:         57035751424 B (57.0 GB)

        Free Space:   18968576 B (19.0 MB)

        |

        +-< Physical Volume 5C662705-785C-4298-9342-C1CB8850ECFC

        |   ----------------------------------------------------

        |   Index:    0

        |   Disk:     disk0s2

        |   Status:   Online

        |   Size:     57035751424 B (57.0 GB)

        |

        +-> Logical Volume Family 2DE0426A-0247-45CB-9425-B6963227AA47

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

            Encryption Type:         None

            |

            +-> Logical Volume 845A76A1-FDBD-4E36-AFDD-A5A62380E3AF

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

                Disk:                  disk1

                Status:                Online

                Size (Total):          56664461312 B (56.7 GB)

                Revertible:            Yes (no decryption required)

                LV Name:               Macintosh HD

                Volume Name:           Macintosh HD

                Content Hint:          Apple_HFS

    Dinhs-MacBook-Pro-2:~ dinhduchiep$ sudo gpt -vv -r show /dev/disk0

    Password:

    gpt show: /dev/disk0: mediasize=121332826112; sectorsize=512; blocks=236978176

    gpt show: /dev/disk0: Suspicious MBR at sector 0

    gpt show: /dev/disk0: Pri GPT at sector 1

    gpt show: /dev/disk0: Sec GPT at sector 236978175

          start       size  index  contents

              0          1         MBR

              1          1         Pri GPT header

              2         32         Pri GPT table

             34          6        

             40     409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

         409640  111397952      2  GPT part - 53746F72-6167-11AA-AA11-00306543ECAC

      111807592    1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

      113077128   57033848      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

      170110976     262144        

      170373120   66603008      5  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

      236976128       2015        

      236978143         32         Sec GPT table

      236978175          1         Sec GPT header

    Dinhs-MacBook-Pro-2:~ dinhduchiep$ sudo fdisk /dev/disk0

    Disk: /dev/disk0 geometry: 14751/255/63 [236978176 sectors]

    Signature: 0xAA55

             Starting       Ending

    #: id  cyl  hd sec -  cyl  hd sec [     start -       size]

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

    1: EE    0   0   2 - 1023 254  63 [         1 -  170373119] <Unknown ID>

    *2: 07 1023 254  63 - 1023 254  63 [ 170373120 -   66603008] HPFS/QNX/AUX

    3: 00    0   0   0 -    0   0   0 [         0 -          0] unused     

    4: 00    0   0   0 -    0   0   0 [         0 -          0] unused     

    Dinhs-MacBook-Pro-2:~ dinhduchiep$ sudo dd if=dev/rdisk0s5 count=1 2>/dev/null | hexdump -C

    Dinhs-MacBook-Pro-2:~ dinhduchiep$ sudo dd if=dev/disk0s5 count=1 2>/dev/null | hexdump -C

    Dinhs-MacBook-Pro-2:~ dinhduchiep$  dd if=dev/rdisk0s5 count=1 2>/dev/null | hexdump -C

    Dinhs-MacBook-Pro-2:~ dinhduchiep$ sudo gdisk /dev/rdisk0

    GPT fdisk (gdisk) version 1.0.1

     

    Warning: Devices opened with shared lock will not have their

    partition table automatically reloaded!

    Partition table scan:

      MBR: hybrid

      BSD: not present

      APM: not present

      GPT: present

     

    Found valid GPT with hybrid MBR; using GPT.

     

    Command (? for help): p

    Disk /dev/rdisk0: 236978176 sectors, 113.0 GiB

    Logical sector size: 512 bytes

    Disk identifier (GUID): 8431629D-2D10-4F1A-A532-9CAC4AD434CE

    Partition table holds up to 128 entries

    First usable sector is 34, last usable sector is 236978142

    Partitions will be aligned on 8-sector boundaries

    Total free space is 264165 sectors (129.0 MiB)

     

    Number  Start (sector)    End (sector)  Size       Code  Name

       1              40          409639   200.0 MiB   EF00  EFI System Partition

       2          409640       111807591   53.1 GiB    AF05  Macintosh HD

       3       111807592       113077127   619.9 MiB   AB00  Recovery HD

       4       113077128       170110975   27.2 GiB    0700  Windows_NTFS_Untitl...

       5       170373120       236976127   31.8 GiB    0700  BOOTCAMP

     

    Command (? for help): r

     

    Recovery/transformation command (? for help): o

     

    Disk size is 236978176 sectors (113.0 GiB)

    MBR disk identifier: 0xF19DEB96

    MBR partitions:

     

    Number  Boot  Start Sector   End Sector   Status      Code

       1                     1    170373119   primary     0xEE

       2      *      170373120    236976127   primary     0x07

     

    Recovery/transformation command (? for help): h

     

    WARNING! Hybrid MBRs are flaky and dangerous! If you decide not to use one,

    just hit the Enter key at the below prompt and your MBR partition table will

    be untouched.

     

    Type from one to three GPT partition numbers, separated by spaces, to be

    added to the hybrid MBR, in sequence: 3 4 5

    Place EFI GPT (0xEE) partition first in MBR (good for GRUB)? (Y/N): y

     

    Creating entry for GPT partition #3 (MBR partition #2)

    Enter an MBR hex code (default AB):

    Set the bootable flag? (Y/N): n

     

    Creating entry for GPT partition #4 (MBR partition #3)

    Enter an MBR hex code (default 07):

    Set the bootable flag? (Y/N): n

     

    Creating entry for GPT partition #5 (MBR partition #4)

    Enter an MBR hex code (default 07):

    Set the bootable flag? (Y/N): y

     

    Recovery/transformation command (? for help): o

     

    Disk size is 236978176 sectors (113.0 GiB)

    MBR disk identifier: 0xF19DEB96

    MBR partitions:

     

    Number  Boot  Start Sector   End Sector   Status      Code

       1                     1    111807591   primary     0xEE

       2             111807592    113077127   primary     0xAB

       3             113077128    170110975   primary     0x07

       4      *      170373120    236976127   primary     0x07

     

    Recovery/transformation command (? for help): w

     

    Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING

    PARTITIONS!!

     

    Do you want to proceed? (Y/N): y

    OK; writing new GUID partition table (GPT) to /dev/rdisk0.

    Warning: Devices opened with shared lock will not have their

    partition table automatically reloaded!

    Warning: The kernel may continue to use old or deleted partitions.

    You should reboot or remove the drive.

    The operation has completed successfully.

    Dinhs-MacBook-Pro-2:~ dinhduchiep$

     

    3. I attached screenshot of Windows bluescreen.

    IMG_4311.JPG

    Can you help to check what's wrong with my steps? Thank a lot for your support.

  • by Loner T,

    Loner T Loner T Mar 28, 2016 8:13 AM in response to Dinh Duc Hiep
    Level 7 (23,603 points)
    Safari
    Mar 28, 2016 8:13 AM in response to Dinh Duc Hiep

    The error code indicates BCD corruption. You will need to use Command Prompt, make the partition read-write using Diskpart.exe, and run bootrec.exe /rebuildBCD to make this work properly.

  • by Dinh Duc Hiep,

    Dinh Duc Hiep Dinh Duc Hiep Mar 28, 2016 9:52 AM in response to Loner T
    Level 1 (4 points)
    Mar 28, 2016 9:52 AM in response to Loner T

    Thank you for your suggestion. I tried the following steps:

    1. Clear attribute read only of the volume Bootcamp which contain Win10 by using Diskpart.

    2. Rebuild boot configuration data by bootrec.exe

     

    At the step 2, after entering "bootrec.exe /RebuildBcd", the system scanned and found 1 Windows installation at C:\Windows. It ask "add installation to boot list" and I choose "yes". Later, it reported that "the requested system device cannot be found".

    Can you tell me what wrong here? I'm using recovery disk of Windows 10 and manipulating commands from command promt.

  • by Loner T,

    Loner T Loner T Mar 28, 2016 10:23 AM in response to Dinh Duc Hiep
    Level 7 (23,603 points)
    Safari
    Mar 28, 2016 10:23 AM in response to Dinh Duc Hiep

    You need to look at Diskpart and map the System volume to a drive letter which has your BCD, otherwise BCD rebuild will fail.

  • by Dinh Duc Hiep,

    Dinh Duc Hiep Dinh Duc Hiep Mar 28, 2016 10:51 AM in response to Loner T
    Level 1 (4 points)
    Mar 28, 2016 10:51 AM in response to Loner T

    I'm not sure I'm following you. Currently I have 4 volumes in Diskpart: volume 0 is the new partition I created from Macintos HD (E:), volume 1 is BOOTCAMP one (C:), volume 2 is one in Usb stick (F:), volume 3 is recovery disk which I'm running command line (D:). How should I do mapping system volume with the volume which has BCD (C?)? Thank you.

  • by Loner T,

    Loner T Loner T Mar 28, 2016 10:57 AM in response to Dinh Duc Hiep
    Level 7 (23,603 points)
    Safari
    Mar 28, 2016 10:57 AM in response to Dinh Duc Hiep
  • by Dinh Duc Hiep,

    Dinh Duc Hiep Dinh Duc Hiep Mar 28, 2016 12:25 PM in response to Loner T
    Level 1 (4 points)
    Mar 28, 2016 12:25 PM in response to Loner T

    I was able to mount EFI volume on Mac, however when I boot to Windows recovery mode by USB stick I could not see EFI volume to assign different drive letter as your suggestion to rebuild BCD. Can you help at this stage? Thank for your patience.

  • by Loner T,

    Loner T Loner T Mar 28, 2016 3:09 PM in response to Dinh Duc Hiep
    Level 7 (23,603 points)
    Safari
    Mar 28, 2016 3:09 PM in response to Dinh Duc Hiep

    Can you post a screen shot of your diskpart list?

  • by Dinh Duc Hiep,

    Dinh Duc Hiep Dinh Duc Hiep Mar 28, 2016 7:03 PM in response to Loner T
    Level 1 (4 points)
    Mar 28, 2016 7:03 PM in response to Loner T

    Please check the screenshot.

    IMG_4312.JPG

  • by Loner T,

    Loner T Loner T Mar 28, 2016 7:48 PM in response to Dinh Duc Hiep
    Level 7 (23,603 points)
    Safari
    Mar 28, 2016 7:48 PM in response to Dinh Duc Hiep

    The Diskpart is reading the MBR we created which 'merged' the EFI and OS X into a single volume, which is Partition 1. You only see Partitions 1-4. The BCD is  located in the EFI partition. You may need to recreate the MBR using 2 4 5, and re-check if you can see and rebuild the BCD.

     

    This is a nasty state, because the Recovery HD can be corrupted by Windows. Once you rebuild the BCD, you need to switch the MBR back to 3 4 5, before you try to boot Windows.

  • by Dinh Duc Hiep,

    Dinh Duc Hiep Dinh Duc Hiep Mar 28, 2016 8:39 PM in response to Loner T
    Level 1 (4 points)
    Mar 28, 2016 8:39 PM in response to Loner T

    I recreated MBR using 2 4 5 but was still unable to see EFI volume. The list of volume in Diskpart is the same, the difference is list of partition where size of the first partition is 200MB, which might refer to EFI. Should I backup data and reinstall Windows now? It took me more than a day to look around solution for this trouble and I'm not sure if there is solution for my nasty state.

  • by Loner T,

    Loner T Loner T Mar 28, 2016 8:48 PM in response to Dinh Duc Hiep
    Level 7 (23,603 points)
    Safari
    Mar 28, 2016 8:48 PM in response to Dinh Duc Hiep

    The first 200MB partition is your EFI partition which holds your BCD.

     

    You can re-install Windows, but you will need to wipe the extra partition and merge it all back, so your partition list before you start Windows installation must have EFI, OSX and Recovery HD only. After you re-install Windows, if you recreate a new partition, you will run into the same issue again.

     

    What year/model is your Mac?

  • by Dinh Duc Hiep,

    Dinh Duc Hiep Dinh Duc Hiep Mar 28, 2016 8:59 PM in response to Loner T
    Level 1 (4 points)
    Mar 28, 2016 8:59 PM in response to Loner T

    My Mac is Macbook Pro Retina 13-inc late 2013.

    The purpose of creating new partition is I want to have a place to share data between Win and Mac. Now it looks like there is no way to do that, right?

    I think this issue is Apple software bug because they design both Bootcamp and DiskUtility but using DiskUtility to create new partition create this kind of trouble for user. My issue is similar to the issue in this thread https://discussions.apple.com/message/29549532#29549532 and we both are unable to find out solution.

  • by Loner T,

    Loner T Loner T Mar 28, 2016 9:37 PM in response to Dinh Duc Hiep
    Level 7 (23,603 points)
    Safari
    Mar 28, 2016 9:37 PM in response to Dinh Duc Hiep

    Your 2013 Mac supports two modes of Windows 8.1/10 installation. In your specific case, if you upgraded from W7, the original installation was MBR/BIOS. Your Mac also defaults to a MBR/BOS installation of W8.1. DU warns you that Windows will not work, if you create an additional partition.

     

    It is not a software bug. The issue in the thread and yours is a combination of BCD in EFI partition, MBR limitation of 4 entries, and manually creating an additional partition. This is unsupported under a BIOS/MBR installation due to limitations of MBRs (4 entries) and three partitions already in use - EFI, OSX and Recovery HD.

     

    The other method of W8.1/10 installation is GPT/EFI which is supported on your Mac. I have it installed on a 2013 rMBP using this method. The BCD is no longer stored in the EFI partition. It requires creating a  Free Space partition which is split into MSR/MSD parts. This method uses GPT-only disks, which allows you to create additional partitions using DU.

     

    You must still install BC drivers for Apple hardware to work properly in Windows.

  • by Dinh Duc Hiep,

    Dinh Duc Hiep Dinh Duc Hiep Mar 28, 2016 9:57 PM in response to Loner T
    Level 1 (4 points)
    Mar 28, 2016 9:57 PM in response to Loner T

    Thank for your explanation, it helps me to understand more about EFI/MBR.

    For my case, I installed a fresh W10 using BootCamp and I did not see a warning from DU when using it to create the new partition.

    I decided to reinstall Windows. Appreciated your support and patience.

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