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Bootcamp gone haywire after Yosemite update

Hello

I recently updated my Macbook Pro to OS X Yosemite 10.10, and as a result, my bootcamp (Windows 7, 64-Home edition) is now gone.

I have tried to follow many of the discussions posted already but non seem to have a clear solution to my issue. I ve had no problem with Bootcamp before with the Lion and Maverick updates, but this time my guess is that the problem probably lies in the fact that I re-sized my partitions using a window software.

Basically the current situation is my Bootcamp no longer appears when I press Alt on start-up.

Upon checking my partition through Disk Utility, here is what I see:

So you see that not only Bootcamp is now changed into disk0s4, there is also a gap of hard drive space that is not used by either Mac or Windows.

I have tried the sudo MBR method but I always encounter errors despite I followed word for word on other discussions. I think they likely have a slight different situation than mine? Here is a sample of my Diskutil List: (I saw a guy with a fifth item listed as Basic Data Bootcamp, but I don't have that line...)

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 450.0 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Microsoft Basic Data 200.8 GB disk0s4

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS Macintosh HD *449.6 GB disk1

Logical Volume on disk0s2

D642C513-A4DB-4E81-9E67-546F88021205

Unlocked Encrypted

Thank you in advance for replies.

MacBook Pro, OS X Yosemite (10.10)

Posted on Oct 20, 2014 3:29 PM

43 replies

Andy TLW Author

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Oct 28, 2014 4:46 PM in response to Loner T

Sounds good. so how do I go from here?

Do I use this command?

sudo gdisk /dev/disk0

880586752

1465147384

0700

ok think i got it. Doing it now.

Loner T

Level 9

59,471 points

Oct 28, 2014 4:40 PM in response to Andy TLW

Andy TLW wrote:

Sounds good. so how do I go from here?

Do I use this command? how do I input the correct numbers?

sudo gdisk /dev/disk0

p

d

4

n

4

86923264 880586752

538218489 1465147384

0700

p

w

y

Please see the changes. Reboot after this. Run the dd command and make sure you can see "R.NTFS" in the first line.

You should be able to see your Bootcamp volume and files in it.

If that works, recreate your Hybrid MBR using the steps in the referenced link. Please post back here, if you have questions, or you want me to paste it here.

Andy TLW Author

Level 1

0 points

Oct 28, 2014 11:02 PM in response to Loner T

IT WORKED!

THANK YOU VERY MUCH LONER!!! 🙂

Ok just to give a summary of what I did.

So first get Testdisk and GPT disk from internet.

Then first use fdisk and Testdisk to find the codes.

For me, the speed of even a quick search is that of 10 hours roughly that always ends up stuck.

So I ended up doing a clean install for Yosemite. Then the Testdisk is quick as few minute to obtain the necessary codes for gdisk command.

Then I just followed the gdisk command to correct the disk.

Here are the gdisk steps and dd Command screenshots.

Then reboot and test using Finder,UtilityDisk, and Startup Disk.

Afterwards I used windows install CDs to repair the drive. And now Bootcamp is back on.

Loner T

Level 9

59,471 points

Oct 29, 2014 4:36 AM in response to Andy TLW

Excellent Work. Good to see it work. Please ensure you can switch between OS X and Windows. Please make a backup of both OS X and Windows.

Venia77

Level 1

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Nov 2, 2014 11:57 AM in response to Loner T

Loner, I think am having the same problem as Andy.

Can you help me check if this is the case?

Loner T

Level 9

59,471 points

Nov 2, 2014 1:32 PM in response to Venia77

Please post a new thread with the output of the commands at the beginning of this thread and post a reference to the new thread here.

Nov 2, 2014 2:05 PM in response to Loner T

Loner I am new to the mac world and need help as well having same exact issues. Can you assist as well what do I need to start a new thread?

Venia77

Level 1

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Nov 2, 2014 2:16 PM in response to Loner T

Bootcamp with Win' 8 won't start after Yosemite

pranag

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Nov 29, 2015 7:53 AM in response to Loner T

Loner,

I'm facing the same problem when I updated to OS X EI Capitan. Below is my setting

prashanths-MacBook-Pro:meanHelloWorld pranag$ sudo gdisk /dev/disk0

Password:

Sorry, try again.

Password:

GPT fdisk (gdisk) version 1.0.1

Warning: Devices opened with shared lock will not have their

partition table automatically reloaded!

NOTE: Write test failed with error number 1. It will be impossible to save

changes to this disk's partition table!

You may need to deactivate System Integrity Protection to use this program. See

https://www.quora.com/How-do-I-turn-off-the-rootless-in-OS-X-El-Capitan-10-11

for more information.

Partition table scan:

MBR: hybrid

BSD: not present

APM: not present

GPT: present

Found valid GPT with hybrid MBR; using GPT.

Command (? for help): p

Disk /dev/disk0: 976773168 sectors, 465.8 GiB

Logical sector size: 512 bytes

Disk identifier (GUID): 0000136E-5E53-0000-413D-0000E64A0000

Partition table holds up to 128 entries

First usable sector is 34, last usable sector is 976773134

Partitions will be aligned on 8-sector boundaries

Total free space is 195508533 sectors (93.2 GiB)

Number Start (sector) End (sector) Size Code Name

1 40 409639 200.0 MiB EF00 EFI system partition

2 409640 291229631 138.7 GiB AF05 Macintosh HD

3 291229632 292499167 619.9 MiB AB00 Recovery HD

4 488007680 976773119 233.1 GiB 0700 BOOTCAMP

Command (? for help): d

Partition number (1-4): 4

Command (? for help): n

Partition number (4-128, default 4): 4

what should be the numbers for n ?

291229631?

How do I proceed?

Thanks

Loner T

Level 9

59,471 points

Nov 29, 2015 8:39 AM in response to pranag

Please start a new discussion and post the output of the GPT and Fdisk commands, and diskutil commands. Have you run Testdisk?

pranag

Level 1

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Nov 29, 2015 9:07 AM in response to Loner T

I started a new discussion here..

update to Capitan corrupted bootcamp

Thanks

May 27, 2016 7:48 AM in response to Loner T

Hey, Loner! Thank you SO much for all your help with this issue. Wish I had the time to learn more about this. I feel completely clueless!

I'm having the same problem with my Windows partition not showing up after an OS X upgrade. Here's my diskutil list. Can you point me in the right direction?

diskutil list /dev/disk0 (internal, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *751.3 GB disk0 1: EFI EFI 209.7 MB disk0s1 2: Apple_CoreStorage Macintosh HD 718.4 GB disk0s2 3: Apple_Boot Recovery HD 650.0 MB disk0s3 4: Microsoft Basic Data BOOTCAMP 32.0 GB disk0s4 /dev/disk1 (internal, virtual): #: TYPE NAME SIZE IDENTIFIER 0: Apple_HFS Macintosh HD +718.0 GB disk1 Logical Volume on disk0s2 AB8475DA-8F76-4C7A-88B2-62722099E783 Unencrypted

Loner T

Level 9

59,471 points

May 27, 2016 6:58 PM in response to Mark Petereit

Can you start a new discussion? Your diskutil list output seems to be a single line. If you are more comfortable posting screen shots on the new discussion, please do so.

Bootcamp gone haywire after Yosemite update