Boot camp missing when update to Yosemite

Hi, I was update to Yosemite and didn't notice the Boot camp bug, is it possible to recover back my windows 7? Because I have important data inside...

Thanks

GPT output

gpt show: /dev/disk0: mediasize=500107862016; sectorsize=512; blocks=976773168

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 976773167

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 488281248 2 GPT part - 53746F72-6167-11AA-AA11-00306543ECAC

488690888 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

489960424 232907800

722868224 253904896 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

976773120 15

976773135 32 Sec GPT table

976773167 1 Sec GPT header

LunaSea:~ Sugizo$

Fdisk output

Disk: /dev/disk0 geometry: 60801/255/63 [976773168 sectors]

Signature: 0xAA55

Starting Ending

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

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

1: EE 1023 254 63 - 1023 254 63 [ 1 - 409639] <Unknown ID>

2: AC 1023 254 63 - 1023 254 63 [ 409640 - 488281248] <Unknown ID>

3: AB 1023 254 63 - 1023 254 63 [ 488690888 - 1269536] Darwin Boot

4: 0C 1023 254 63 - 1023 254 63 [ 722868224 - 253904896] Win95 FAT32L

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

Posted on Nov 12, 2014 5:56 AM

30 replies

Nov 13, 2014 3:41 PM in response to Loner T

It Works... I can choose the Windows partition and able to load Windows, Haha....

But in Mac, the Startup Disk still not showing the bootcamp partition, is it normal?

And when I hold down the alt key when open the MacBook, the Discovery Partition option was gone, only left Mac and Windows, is it normal?

Loner T

Level 9

59,536 points

Nov 13, 2014 4:07 PM in response to RockingGarage

Your MBR is incorrect and does not seem to match the GPT.

Your MBR is the following. Your second entry should be starting with AC on Yosemite with a CoreStorage volume. Recreate and use 2 3 4 and rest is all defaults except the 'y' for the bootable flag for partition 4 and Test.

Disk: /dev/disk0 geometry: 60801/255/63 [976773168 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: AF 25 127 15 - 1023 254 63 [ 409640 - 488281248] HFS+

3: AB 1023 254 63 - 1023 254 63 [ 488690888 - 1269536] Darwin Boot

*4: 07 1023 254 63 - 1023 254 63 [ 489961472 - 486811641] HPFS/QNX/AUX

This is a working MBR on a Yosemite machine (ignore the start/size because my disk is different).

Disk: /dev/disk0 geometry: 31130/255/63 [500118192 sectors]

Signature: 0xAA55

Starting Ending

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

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

1: EE 1023 254 63 - 1023 254 63 [ 1 - 409639] <Unknown ID>

2: AC 1023 254 63 - 1023 254 63 [ 409640 - 250392096] <Unknown ID>

3: AB 1023 254 63 - 1023 254 63 [ 250801736 - 1269536] Darwin Boot

*4: 07 1023 254 63 - 1023 254 63 [ 252071936 - 248045568] HPFS/QNX/AUX

Nov 13, 2014 4:29 PM in response to Loner T

Which step should I start from?

Here?

5. Once you have a working GPT#4, a new hybrid MBR needs to be created which will overwrite what you see in your Fdisk output. This is also done using GPT Fdisk (Gdisk). Your numbers will look different than what are in the following example. In most cases, you will use the default except entry 4, which should have a 'y' for bootable flag.

sudo gdisk /dev/disk0

GPT fdisk (gdisk) version 0.8.10

......."

Loner T

Level 9

59,536 points

Nov 13, 2014 4:38 PM in response to RockingGarage

Yes, that is correct.

Nov 13, 2014 4:42 PM in response to Loner T

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

Enter an MBR hex code (default AF): AF

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

Regarding the step you given, you are writing AF in partition #2, is it correct?

Loner T

Level 9

59,536 points

Nov 13, 2014 4:46 PM in response to RockingGarage

Use the default. My example came from a non-Corestorage volume system. If you look at the later MBR example from a Yosemite system, you can see the difference.

Nov 14, 2014 3:34 AM in response to Loner T

Hi, I think I know where is my problem, because I have Tuxera.....

Loner T

Level 9

59,536 points

Nov 14, 2014 4:30 AM in response to RockingGarage

Good that you found it. I need to start asking about third-party NTFS drivers at the beginning. 😉

Post your GPT so it can be checked. Disable Tuxera and test. Your Yosemite volume is CoreStorage. Have you checked with Tuxera when they will support CS volumes. Currently they only support JHFS+ only.

Also, please see http://www.tuxera.com/products/tuxera-ntfs-for-mac/faq/#startup-disk

Nov 14, 2014 4:39 AM in response to Loner T

When I disable the Tuxera only for Bootcamp, it become like this

6. a. Test 1 - Can you see your Bootcamp volume in Finder. (YES)

b. Test 2 - Can you files in the Bootcamp volume? (NO)

c. Test 3 - Can you see Bootcamp in your System Preferences -> Startup Disk. (YES)

I have no idea about the Corestorage and JHFS+, but I will just leave it in this situation. Shouldn't be the problem right?

Loner T

Level 9

59,536 points

Nov 14, 2014 4:56 AM in response to RockingGarage

Can you double click on the Bootcamp volume in Finder? If 6a works, 6b should also work.

JHFS+ and CoreStorage are two different types of filesystems that Macs support. CoreStorage was first available in 10.8.5, but is the default filesystem on Yosemite. FileValult2 also uses CoreStorage.

Nov 14, 2014 5:22 AM in response to Loner T

Hi, yes, it shows in the FInder as below, only can view, can't add folder or edit.

Loner T

Level 9

59,536 points

Nov 14, 2014 5:28 AM in response to RockingGarage

Apple does not provide write capabilities in their native NTFS driver. You can read, but not write. So 6b is successful.

Tuxera/Paragon/NTFS-3g can provide read-write to NTFS, but from Windows to write to CS is not supported.

Please create a backup of OS X and Windows.

Nov 14, 2014 5:31 AM in response to Loner T

I see... Thanks very much, you are saving lots of life here...

Mac OS X back up with time machine? Do you have any idea which software can be use to backup bootcamp?

Loner T

Level 9

59,536 points

Nov 14, 2014 5:34 AM in response to RockingGarage

OS X with Time Machine.

For Windows, you can either use Winclone, which is a commercial tool, or you can create an external partition which is formatted NTFS and use the built-in Windows Backup to back up Windows.

Nov 14, 2014 5:42 AM in response to Loner T

I created a thread regarding my boot camp issue after Yosemite, please help!

Boot camp doesn't work after Yosemite update..

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Boot camp missing when update to Yosemite