adamsouthern
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Q: Bootcamp Broken after Resizing and OSX Update

Hello, so after updating to Yosemite 10.10.3, my bootcamp partition, which was previously resized, has become unbootable. I can't read the partition in finder and can't see it in Startup Disk. It, however appears as "disk0s4" in disk utility. I've posted some outputs of commands suggested in another thread. Hopefully this will help fix this issue.

 

Adams-MacBook-Pro:~ Adam$ sudo fdisk /dev/disk0

Password:

Disk: /dev/disk0 geometry: 30515/255/63 [490234752 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: 03   25 127  15 - 1023 254  63 [    409640 -  255104784] XENIX /usr

*3: 03 1023 254  63 - 1023 254  63 [ 255514424 -    1269536] XENIX /usr

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

Adams-MacBook-Pro:~ Adam$ diskutil list

/dev/disk0

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *251.0 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:                  Apple_HFS Macintosh HD            130.6 GB   disk0s2

   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

   4:       Microsoft Basic Data                         70.0 GB    disk0s4

Adams-MacBook-Pro:~ Adam$ sudo gpt -vv -r show /dev/disk0

gpt show: /dev/disk0: mediasize=251000193024; sectorsize=512; blocks=490234752

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 490234751

      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  255104784      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC

  255514424    1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

  256783960   96733608       

  353517568  136716288      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

  490233856        863       

  490234719         32         Sec GPT table

  490234751          1         Sec GPT header

Adams-MacBook-Pro:~ Adam$

Output of the command suggested:

Adams-MacBook-Pro:~ Adam$ sudo dd if=/dev/rdisk0s4 count=1 2>/dev/null | hexdump -C

00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|

*

00000200

 

Thanks in advance.

MacBook Pro (Retina, 13-inch, Early 2013), OS X Yosemite (10.10.3), Windows 8.1

Posted on May 7, 2015 9:56 AM

by Loner T,Solvedanswer
Loner T Loner T
Level 7 (24,800 points)
Safari
A:

Leave your Testdisk display and start a new Terminal Window. You need to use the following steps. You will need to install GPT Fdisk (aka Gdisk).

 

If you see any error messages during the following steps, please stop and post back here with the error message. The following steps have values from your Testdisk output (and you can verify) in Steps 7 and 8. Notice the '+' in step 8.

 

Rebuild GPT4 using start/end offsets

 

  1. Sudo gdisk /dev/rdisk0
  2. P  (print the full list of parts)
  3. D  (delete)
  4. 4  (part 4)
  5. N  (new part)
  6. 4  (part 4)
  7. 280403968 - Start offset in bytes  (start point for Bootcamp part)
  8. +209829881  - Size offset (as opposed to End offset)
  9. 0700 (Windows part type)
  10. P  (print list of all parts just to see what changes will be made)
  11. W (Write the new GPT)
  12. Y  (Yes! really write the new GPT)

This will delete and re-write the GPT partition info for /dev/disk0s4.


Rebuild MBR to match the new GPT information thus resetting the Hybrid MBR. Use defaults for other questions (like partition codes). The only values that need modifications are the Boot flags and step 10. Accept all other defaults that Gdisk offers.

  1. Sudo gdisk /dev/disk0
  2. P  (Print list of parts)
  3. R  (Recover)
  4. H (chooses Hybrid)
  5. O (print current Hybrid MBR)
  6. Partitions numbers to be hybridized: 2 3 4
  7. Y  (Good for GRUB question)
  8. N  (part 2 boot flag)
  9. N  (part 3 boot flag)
  10. Y  (part 4 boot flag make NTFS bootable partition)
  11. O  (print current Hybrid MBR)
  12. W (Write the new MBR)
  13. Y (Yes! write the new MBR)
  14. Reboot

 

Here is sample Q&A for this section. Please notice the Press Enter/Return.

 

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

 

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

Enter an MBR hex code (default AF): Press Enter/Return

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

 

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

Enter an MBR hex code (default AB): Press Enter/Return

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

 

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

Enter an MBR hex code (default 07): Press Enter/Return

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

 

Test 1 - Does Bootcamp Volume show up in Finder?

Test 2 - Can you see files in Bootcamp Volume?

Test 3 - Can you select Bootcamp in System Preferences -> Startup Disk?

Test 4 - If Test 3 is successful, select Bootcamp and Click Restart.

Posted on May 8, 2015 2:59 PM

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adamsouthern

Q: Bootcamp Broken after Resizing and OSX Update

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  • by adamsouthern,

    adamsouthern adamsouthern May 11, 2015 10:33 AM in response to Loner T
    Level 1 (0 points)
    May 11, 2015 10:33 AM in response to Loner T

    Could you recommend any free OSX software for backing up bootcamp?

  • by Loner T,

    Loner T Loner T May 11, 2015 11:00 AM in response to adamsouthern
    Level 7 (24,800 points)
    Safari
    May 11, 2015 11:00 AM in response to adamsouthern

    Use the Windows Backup/Restore which is part of the core  Windows OS. Create an FAT partition on an external disk, connect to Windows, format it as NTFS and run Windows Backup/Restore and use this partition to backup. It needs to be at least the same size as the original Windows partition size.

  • by adamsouthern,

    adamsouthern adamsouthern May 11, 2015 1:11 PM in response to Loner T
    Level 1 (0 points)
    May 11, 2015 1:11 PM in response to Loner T

    PPartitioned the drive, go into Windows, now the whole drive is read only?

  • by Loner T,

    Loner T Loner T May 11, 2015 1:17 PM in response to adamsouthern
    Level 7 (24,800 points)
    Safari
    May 11, 2015 1:17 PM in response to adamsouthern

    Can you plug in the external drive and post the output of

     

    diskutil list

    sudo gpt -vv -r show /dev/diskN

     

    'N' should be the numeric value from diskutil list that points to the external disk. For example disk0 has 0, disk1 has 1, and so on.

  • by adamsouthern,

    adamsouthern adamsouthern May 12, 2015 8:52 AM in response to Loner T
    Level 1 (0 points)
    May 12, 2015 8:52 AM in response to Loner T

    Screen Shot 2015-05-12 at 16.51.44.png

  • by Loner T,

    Loner T Loner T May 12, 2015 10:58 AM in response to adamsouthern
    Level 7 (24,800 points)
    Safari
    May 12, 2015 10:58 AM in response to adamsouthern

    If you switch to Windows and plug this external drive in, can you go into Control Panel -> Administrative Tools -> Computer Management -> Disk Management and check what disk show up?

  • by adamsouthern,

    adamsouthern adamsouthern May 13, 2015 1:18 PM in response to Loner T
    Level 1 (0 points)
    May 13, 2015 1:18 PM in response to Loner T

    screenshot.PNG

  • by Loner T,

    Loner T Loner T May 13, 2015 1:29 PM in response to adamsouthern
    Level 7 (24,800 points)
    Safari
    May 13, 2015 1:29 PM in response to adamsouthern

    What drives do you see in My Computer?

  • by adamsouthern,

    adamsouthern adamsouthern May 13, 2015 1:32 PM in response to Loner T
    Level 1 (0 points)
    May 13, 2015 1:32 PM in response to Loner T

    Just BOOTCAMP and Mac

  • by Loner T,

    Loner T Loner T May 13, 2015 4:13 PM in response to adamsouthern
    Level 7 (24,800 points)
    Safari
    May 13, 2015 4:13 PM in response to adamsouthern

    Using the following setup...

     

    Internal disk…

     

    diskutil list

    /dev/disk0

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *256.1 GB   disk0

       1:                        EFI EFI                     209.7 MB   disk0s1

       2:          Apple_CoreStorage                         128.2 GB   disk0s2

       3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

       4:       Microsoft Basic Data BOOTCAMP                127.0 GB   disk0s4

    /dev/disk1

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                  Apple_HFS OSY-MBP13              *126.4 GB   disk1

                                     Logical Volume on disk0s2

                                     8A0116D5-7E1E-44D8-B2A0-8D4E4D48298D

                                     Unencrypted

     

    External disk…

     

    diskutil list

    /dev/disk0

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *256.1 GB   disk0

       1:                        EFI EFI                     209.7 MB   disk0s1

       2:          Apple_CoreStorage                         128.2 GB   disk0s2

       3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

       4:       Microsoft Basic Data BOOTCAMP                127.0 GB   disk0s4

    /dev/disk1

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:                  Apple_HFS OSY-MBP13              *126.4 GB   disk1

                                     Logical Volume on disk0s2

                                     8A0116D5-7E1E-44D8-B2A0-8D4E4D48298D

                                     Unencrypted

    /dev/disk2

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *500.1 GB   disk2

       1:                        EFI EFI                     209.7 MB   disk2s1

       2:                  Apple_HFS OSX-Server-HD           128.0 GB   disk2s2

       3:                 Apple_Boot Recovery HD             650.0 MB   disk2s3

       4:       Microsoft Basic Data MVTOWE                  192.0 GB   disk2s4

       5:                  Apple_HFS TM-OSY                  143.1 GB   disk2s5

       6:                  Apple_HFS BCA                     35.9 GB    disk2s6

     

    I have these before and after images from Disk Management and My Computer.

     

    W8.1-DiskManagement-BeforeExternalDisk.PNG

     

    W8.1-MyComputerBefore.PNG

     

    W8.1-DiskManagement-AfterExternalDisk.PNG

     

    W8.1-MyComputerAfter.PNG

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