dgnhlp

Q: Lost boot ability to OSX and Windows 10

So I had a working bootcamp install of Windows 10 and was able to switch back and forth between WIN10 and OSX. I decided I wanted to also install Linux so I went into OSX and cut a partition off of the OSX install. This caused me to lose ability to boot into Windows 10.

 

Using very limited research and some of the commands found in this thread: Repairing Boot Camp after creating new partition I managed to make things worse and ended up unable to boot to either OS. I ended up installing windows 7 on the partition I created for Linux and that is now the only thing I am able to boot into.

 

Is there anyone who can help me repair my MBR through windows 7 to restore access to my windows 10 and OSX partitions?

 

I appreciate any help in advance!

MacBook Pro

Posted on Aug 23, 2015 12:45 PM

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Q: Lost boot ability to OSX and Windows 10

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  • by Loner T,

    Loner T Loner T Aug 29, 2015 4:05 PM in response to dgnhlp
    Level 7 (24,202 points)
    Safari
    Aug 29, 2015 4:05 PM in response to dgnhlp

    1. What i steh year/model of your Mac?

    2. Can you post the output of the following Terminal commands?

     

    sudo dd if=/dev/rdisk0s4 count=1 2>/dev/null | hexdump -C

    sudo dd if=/dev/rdisk0s5 count=1 2>/dev/null | hexdump -C

     

    The "sudo" commands will prompt for your password, and it will not be echoed back. You may also see a warning about improper use of "sudo" and potential data loss due to "abuse" of the command.

  • by dgnhlp,

    dgnhlp dgnhlp Aug 29, 2015 4:09 PM in response to Loner T
    Level 1 (0 points)
    Aug 29, 2015 4:09 PM in response to Loner T

    sudo dd if=/dev/rdisk0s4 count=1 2>/dev/null | hexdump -C

    Password:

    00000000  eb 52 90 4e 54 46 53 20  20 20 20 00 02 08 00 00  |.R.NTFS    .....|

    00000010  00 00 00 00 00 f8 00 00  3f 00 ff 00 00 c8 bd 0b  |........?.......|

    00000020  00 00 00 00 80 00 80 00  ff e7 8d 0b 00 00 00 00  |................|

    00000030  00 00 0c 00 00 00 00 00  02 00 00 00 00 00 00 00  |................|

    00000040  f6 00 00 00 01 00 00 00  bb f4 43 b6 2a 44 b6 2a  |..........C.*D.*|

    00000050  00 00 00 00 fa 33 c0 8e  d0 bc 00 7c fb 68 c0 07  |.....3.....|.h..|

    00000060  1f 1e 68 66 00 cb 88 16  0e 00 66 81 3e 03 00 4e  |..hf......f.>..N|

    00000070  54 46 53 75 15 b4 41 bb  aa 55 cd 13 72 0c 81 fb  |TFSu..A..U..r...|

    00000080  55 aa 75 06 f7 c1 01 00  75 03 e9 dd 00 1e 83 ec  |U.u.....u.......|

    00000090  18 68 1a 00 b4 48 8a 16  0e 00 8b f4 16 1f cd 13  |.h...H..........|

    000000a0  9f 83 c4 18 9e 58 1f 72  e1 3b 06 0b 00 75 db a3  |.....X.r.;...u..|

    000000b0  0f 00 c1 2e 0f 00 04 1e  5a 33 db b9 00 20 2b c8  |........Z3... +.|

    000000c0  66 ff 06 11 00 03 16 0f  00 8e c2 ff 06 16 00 e8  |f...............|

    000000d0  4b 00 2b c8 77 ef b8 00  bb cd 1a 66 23 c0 75 2d  |K.+.w......f#.u-|

    000000e0  66 81 fb 54 43 50 41 75  24 81 f9 02 01 72 1e 16  |f..TCPAu$....r..|

    000000f0  68 07 bb 16 68 70 0e 16  68 09 00 66 53 66 53 66  |h...hp..h..fSfSf|

    00000100  55 16 16 16 68 b8 01 66  61 0e 07 cd 1a 33 c0 bf  |U...h..fa....3..|

    00000110  28 10 b9 d8 0f fc f3 aa  e9 5f 01 90 90 66 60 1e  |(........_...f`.|

    00000120  06 66 a1 11 00 66 03 06  1c 00 1e 66 68 00 00 00  |.f...f.....fh...|

    00000130  00 66 50 06 53 68 01 00  68 10 00 b4 42 8a 16 0e  |.fP.Sh..h...B...|

    00000140  00 16 1f 8b f4 cd 13 66  59 5b 5a 66 59 66 59 1f  |.......fY[ZfYfY.|

    00000150  0f 82 16 00 66 ff 06 11  00 03 16 0f 00 8e c2 ff  |....f...........|

    00000160  0e 16 00 75 bc 07 1f 66  61 c3 a0 f8 01 e8 09 00  |...u...fa.......|

    00000170  a0 fb 01 e8 03 00 f4 eb  fd b4 01 8b f0 ac 3c 00  |..............<.|

    00000180  74 09 b4 0e bb 07 00 cd  10 eb f2 c3 0d 0a 41 20  |t.............A |

    00000190  64 69 73 6b 20 72 65 61  64 20 65 72 72 6f 72 20  |disk read error |

    000001a0  6f 63 63 75 72 72 65 64  00 0d 0a 42 4f 4f 54 4d  |occurred...BOOTM|

    000001b0  47 52 20 69 73 20 6d 69  73 73 69 6e 67 00 0d 0a  |GR is missing...|

    000001c0  42 4f 4f 54 4d 47 52 20  69 73 20 63 6f 6d 70 72  |BOOTMGR is compr|

    000001d0  65 73 73 65 64 00 0d 0a  50 72 65 73 73 20 43 74  |essed...Press Ct|

    000001e0  72 6c 2b 41 6c 74 2b 44  65 6c 20 74 6f 20 72 65  |rl+Alt+Del to re|

    000001f0  73 74 61 72 74 0d 0a 00  8c a9 be d6 00 00 55 aa  |start.........U.|

    00000200

     

     

     

    and :

    sudo dd if=/dev/rdisk0s5 count=1 2>/dev/null | hexdump -C

    00000000  eb 52 90 4e 54 46 53 20  20 20 20 00 02 08 00 00  |.R.NTFS    .....|

    00000010  00 00 00 00 00 f8 00 00  3f 00 ff 00 00 b0 4b 17  |........?.....K.|

    00000020  00 00 00 00 80 00 80 00  ff af ec 22 00 00 00 00  |..........."....|

    00000030  00 00 0c 00 00 00 00 00  02 00 00 00 00 00 00 00  |................|

    00000040  f6 00 00 00 01 00 00 00  a5 a4 46 b0 d6 46 b0 ae  |..........F..F..|

    00000050  00 00 00 00 fa 33 c0 8e  d0 bc 00 7c fb 68 c0 07  |.....3.....|.h..|

    00000060  1f 1e 68 66 00 cb 88 16  0e 00 66 81 3e 03 00 4e  |..hf......f.>..N|

    00000070  54 46 53 75 15 b4 41 bb  aa 55 cd 13 72 0c 81 fb  |TFSu..A..U..r...|

    00000080  55 aa 75 06 f7 c1 01 00  75 03 e9 dd 00 1e 83 ec  |U.u.....u.......|

    00000090  18 68 1a 00 b4 48 8a 16  0e 00 8b f4 16 1f cd 13  |.h...H..........|

    000000a0  9f 83 c4 18 9e 58 1f 72  e1 3b 06 0b 00 75 db a3  |.....X.r.;...u..|

    000000b0  0f 00 c1 2e 0f 00 04 1e  5a 33 db b9 00 20 2b c8  |........Z3... +.|

    000000c0  66 ff 06 11 00 03 16 0f  00 8e c2 ff 06 16 00 e8  |f...............|

    000000d0  4b 00 2b c8 77 ef b8 00  bb cd 1a 66 23 c0 75 2d  |K.+.w......f#.u-|

    000000e0  66 81 fb 54 43 50 41 75  24 81 f9 02 01 72 1e 16  |f..TCPAu$....r..|

    000000f0  68 07 bb 16 68 70 0e 16  68 09 00 66 53 66 53 66  |h...hp..h..fSfSf|

    00000100  55 16 16 16 68 b8 01 66  61 0e 07 cd 1a 33 c0 bf  |U...h..fa....3..|

    00000110  28 10 b9 d8 0f fc f3 aa  e9 5f 01 90 90 66 60 1e  |(........_...f`.|

    00000120  06 66 a1 11 00 66 03 06  1c 00 1e 66 68 00 00 00  |.f...f.....fh...|

    00000130  00 66 50 06 53 68 01 00  68 10 00 b4 42 8a 16 0e  |.fP.Sh..h...B...|

    00000140  00 16 1f 8b f4 cd 13 66  59 5b 5a 66 59 66 59 1f  |.......fY[ZfYfY.|

    00000150  0f 82 16 00 66 ff 06 11  00 03 16 0f 00 8e c2 ff  |....f...........|

    00000160  0e 16 00 75 bc 07 1f 66  61 c3 a0 f8 01 e8 09 00  |...u...fa.......|

    00000170  a0 fb 01 e8 03 00 f4 eb  fd b4 01 8b f0 ac 3c 00  |..............<.|

    00000180  74 09 b4 0e bb 07 00 cd  10 eb f2 c3 0d 0a 41 20  |t.............A |

    00000190  64 69 73 6b 20 72 65 61  64 20 65 72 72 6f 72 20  |disk read error |

    000001a0  6f 63 63 75 72 72 65 64  00 0d 0a 42 4f 4f 54 4d  |occurred...BOOTM|

    000001b0  47 52 20 69 73 20 6d 69  73 73 69 6e 67 00 0d 0a  |GR is missing...|

    000001c0  42 4f 4f 54 4d 47 52 20  69 73 20 63 6f 6d 70 72  |BOOTMGR is compr|

    000001d0  65 73 73 65 64 00 0d 0a  50 72 65 73 73 20 43 74  |essed...Press Ct|

    000001e0  72 6c 2b 41 6c 74 2b 44  65 6c 20 74 6f 20 72 65  |rl+Alt+Del to re|

    000001f0  73 74 61 72 74 0d 0a 00  8c a9 be d6 00 00 55 aa  |start.........U.|

    00000200

     

     

    apologies if it's formatted badly.

  • by Loner T,

    Loner T Loner T Aug 29, 2015 4:18 PM in response to dgnhlp
    Level 7 (24,202 points)
    Safari
    Aug 29, 2015 4:18 PM in response to dgnhlp

    No worries about formatting. . Both partitions have valid NTFS headers. The following is a test. We are going to switch the boot ability of the MBR and make the 92GB bootable. Please ignore the i386 MBR error message but not any others.

     

    sudo fdisk -e /dev/disk0

    p

    setpid 3

    07

    flag 3

    p

    w

    y

     

    Reboot and test the version of Windows when selected from System Preferences -> Startup Disk and Alt/Option key after power cycling the Mac, both

  • by dgnhlp,

    dgnhlp dgnhlp Aug 29, 2015 5:19 PM in response to Loner T
    Level 1 (0 points)
    Aug 29, 2015 5:19 PM in response to Loner T

    i rebooted and chose windows after holding down the option key and got this screen. image15.png

  • by Loner T,

    Loner T Loner T Aug 29, 2015 5:45 PM in response to dgnhlp
    Level 7 (24,202 points)
    Safari
    Aug 29, 2015 5:45 PM in response to dgnhlp

    1. What year/model is your Mac?

    2. Was the second Windows installation created using Windows or OS X? What was the order? Was W10 already working when W7 was installed, or the reverse.

    3. Can you boot this installation of Windows in Safe Mode?

  • by dgnhlp,

    dgnhlp dgnhlp Aug 29, 2015 7:17 PM in response to Loner T
    Level 1 (0 points)
    Aug 29, 2015 7:17 PM in response to Loner T

    13 inch late 2011 model macbook pro.

     

    2) The second windows installation (windows 7) was installed using a windows CD. It was only installed because i lost access to both OSX AND Windows 10 (both of which were working before I decided to make a partition for a 3rd OS and started tweaking things trying to fix it.)

     

    3) ill try to boot into safe mode now and ill let you know. EDIT: can not boot into safe mode.

  • by Loner T,

    Loner T Loner T Aug 29, 2015 8:17 PM in response to dgnhlp
    Level 7 (24,202 points)
    Safari
    Aug 29, 2015 8:17 PM in response to dgnhlp

    The 2011 models are 'officially' not supported by Apple according to Use Windows 10 on your Mac with Boot Camp - Apple Support . This is usually to avoid driver issues. There are many user who are running W10 on older Macs with reasonable success.

     

    Do you have any significant data on either W7 or W10 that you want to save, or are these new enough to be deleted and re-installed?

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