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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

Best reply

Loner T

Level 9

59,471 points

Posted on May 7, 2015 10:51 AM

Can you use Lost my Windows 7 Boot Camp partition after upgrading to Yosemite. Help! as a reference (you have the same issue) and download Testdisk and GPT Fdisk and get started with a Testdisk scan?

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54 replies

Loner T

Level 9

59,471 points

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.

adamsouthern Author

Level 1

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May 11, 2015 1:11 PM in response to Loner T

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

Loner T

Level 9

59,471 points

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.

adamsouthern Author

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May 12, 2015 8:52 AM in response to Loner T

Loner T

Level 9

59,471 points

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?

adamsouthern Author

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May 13, 2015 1:18 PM in response to Loner T

Loner T

Level 9

59,471 points

May 13, 2015 1:29 PM in response to adamsouthern

What drives do you see in My Computer?

adamsouthern Author

Level 1

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May 13, 2015 1:32 PM in response to Loner T

Just BOOTCAMP and Mac

Loner T

Level 9

59,471 points

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.

Bootcamp Broken after Resizing and OSX Update