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Q: Windows- bootcamp won't start after installing OSX Yosemite - Ameriguayo

Like so many others, I installed OSX Yosemite this morning and now Boot Camp no longer works.

 

After I updated to Yosemite I restarted my computer, held down  alt, and was presented nothing but a Macintosh HD. I followed “Loner T’s” instructions. Here's my info...

 

 

MiMac:~ Mike$ diskutil list

/dev/disk0

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *750.2 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:          Apple_CoreStorage                         351.0 GB   disk0s2

   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

   4:       Microsoft Basic Data                         397.7 GB   disk0s4

/dev/disk1

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                  Apple_HFS Macintosh HD           *350.6 GB   disk1

                                 Logical Volume on disk0s2

                                 8FA5E92E-AD22-4963-A728-00057E6BEB99

                                 Unencrypted

MiMac:~ Mike$ diskutil cs list

CoreStorage logical volume groups (1 found)

|

+-- Logical Volume Group BACE3EFD-026C-4E8C-A749-2F22BE55CD85

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

    Name:         Macintosh HD

    Status:       Online

    Size:         350971142144 B (351.0 GB)

    Free Space:   18915328 B (18.9 MB)

    |

    +-< Physical Volume B5CB58D7-8B4E-4E8F-B676-4A3A08C4C10C

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

    |   Index:    0

    |   Disk:     disk0s2

    |   Status:   Online

    |   Size:     350971142144 B (351.0 GB)

    |

    +-> Logical Volume Family 22A44CAD-28FC-42EE-9017-FA335F527AF8

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

        Encryption Status:       Unlocked

        Encryption Type:         None

        Conversion Status:       NoConversion

        Conversion Direction:    -none-

        Has Encrypted Extents:   No

        Fully Secure:            No

        Passphrase Required:     No

        |

        +-> Logical Volume 8FA5E92E-AD22-4963-A728-00057E6BEB99

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

            Disk:                  disk1

            Status:                Online

            Size (Total):          350599905280 B (350.6 GB)

            Conversion Progress:   -none-

            Revertible:            Yes (no decryption required)

            LV Name:               Macintosh HD

            Volume Name:           Macintosh HD

            Content Hint:          Apple_HFS

MiMac:~ Mike$ sudo gpt -vv -r show /dev/disk0

Password:

gpt show: /dev/disk0: mediasize=750156374016; sectorsize=512; blocks=1465149168

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 1465149167

       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   685490512      2  GPT part - 53746F72-6167-11AA-AA11-00306543ECAC

   685900152     1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

   687169688   776709904      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

  1463879592     1269543        

  1465149135          32         Sec GPT table

  1465149167           1         Sec GPT header

MiMac:~ Mike$ sudo fdisk /dev/disk0

Disk: /dev/disk0 geometry: 91201/255/63 [1465149168 sectors]

Signature: 0xAA55

         Starting       Ending

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

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

1: EE    0   0   2 -   25 127  14 [         1 -     409639] <Unknown ID>

2: AC 1023 254  63 - 1023 254  63 [    409640 -  685490512] <Unknown ID>

3: AB 1023 254  63 - 1023 254  63 [ 685900152 -    1269536] Darwin Boot

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

MiMac:~ Mike$

MacBook Pro (13-inch Mid 2012), OS X Yosemite (10.10)

Posted on Nov 15, 2014 1:30 PM

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Q: Windows- bootcamp won't start after installing OSX Yosemite - Ameriguayo

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  • Helpful answers

  • by Loner T,

    Loner T Loner T Nov 16, 2014 6:08 AM in response to ameriguayo
    Level 7 (24,601 points)
    Safari
    Nov 16, 2014 6:08 AM in response to ameriguayo

    Your case may be simpler to resolve. You do not have the MBR entry for Windows.

     

    Do you a NTFS header "R.NTFS" when you run the following command in Terminal?

     

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