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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

59,477 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

59,477 points

May 9, 2015 10:42 AM in response to adamsouthern

Can you post the output of

sudo gpt -vv -r show /dev/disk0

sudo fdisk /dev/disk0

Can you also try

a. Resetting the System Management Controller (SMC) on your Mac - Apple Support

b. How to Reset NVRAM on your Mac - Apple Support

adamsouthern Author

Level 1

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May 9, 2015 10:49 AM in response to Loner T

Right, well I'm going to remove Windows and re-add it. Even if i could fix this, I've got what i needed.

Thanks for the help though!

Loner T

Level 9

59,477 points

May 9, 2015 11:36 AM in response to adamsouthern

Please post back, if you run into any other issues.

adamsouthern Author

Level 1

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May 9, 2015 11:56 AM in response to Loner T

Haha, glad you're still with me. Upon trying to remove the partition, and restore OS X to a single partition, i get this:

EDIT: I still have 13GB of free space, unassigned. Can't even assign it to OS X. :/

Loner T

Level 9

59,477 points

May 9, 2015 12:06 PM in response to adamsouthern

Can you post the output of

sudo gpt -vv -r show /dev/disk0

diskutil cs list

adamsouthern Author

Level 1

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May 9, 2015 12:10 PM in response to Loner T

Loner T

Level 9

59,477 points

May 9, 2015 12:20 PM in response to adamsouthern

This is expected. If you recall, the 11.5Gb discussion, BCA does not expect it and hence will give you an error. The safest option is

1. Back up OSX using Time Machine - Mac Basics: Time Machine backs up your Mac - Apple Support.

2. Boot into Internet Recovery - OS X: About OS X Recovery - Apple Support.

3. Erase your internal drive and restore from the TM backup in Step 1 - OS X Yosemite: Recover your entire system.

Please be aware that TM does not backup Bootcamp partitions.

If you Terminal commands to achieve, it can be done, provided you want to do it that way.

adamsouthern Author

Level 1

0 points

May 9, 2015 12:29 PM in response to Loner T

Alright, just to make sure, reinstalling from Windows 8 itself (PC Settings > Recovery and Updates > Reinstall) won't work right?

Apple support, regarding reinstalling:

BJ:

the best way really is using the bootcamp assistant

BJ:

I think that is a wise decision

BJ:

Loner T

Level 9

59,477 points

May 9, 2015 12:34 PM in response to adamsouthern

No it will only address the current BC Partition. The 11.5Gb is 'lost' at this point. If you are up for some Terminal gymnastics, it can be done in a relatively shorter time window.

adamsouthern Author

Level 1

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May 9, 2015 12:38 PM in response to Loner T

This will require a TM backup, right? It's just I'm not currently home. But sure, as long as I'm guided through it, again I've never needed do do such operations.

adamsouthern Author

Level 1

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May 10, 2015 11:46 PM in response to Loner T

Bump.

Loner T

Level 9

59,477 points

May 11, 2015 4:26 AM in response to adamsouthern

Yes, it requires a TM backup. You will lose your current Windows installation, so backup your files, before you erase the internal disk and restore from TM.