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Bootcamp not accessible after Yosemite update

So here I start a new thread...

What I did:

I updated my Mavericks to Yosemite and after installing it my bootcamp partition seemed to be gone!

Just possible to boot the Mac partition and I saw that I now have a recovery partition which I didn't have yet.

In Disk Utility I can see that there is a partition but its called disk0s4 and is inaktive...cant activate it.

Due several tries i could manage that while restarting the mac and pressing ALT the Bootcamp Partition came up again but choosing it it says "Operating System is missing"

What am I to do now?

I really need that data on the BC partition but I can't even read the data.

Would be very thankful if someone helped me...thanks.

Its a MBP 17" mid 2009. On a 500GB Samsung 840 Evo SSD

Posted on Mar 22, 2015 8:26 AM

55 replies

Nosedragon Author

Level 1

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Mar 27, 2015 4:28 PM in response to Loner T

what shall i put in for step 8 in rebuilding GPT4?

976771072?

Loner T

Level 9

59,536 points

Mar 27, 2015 4:34 PM in response to Nosedragon

You can use the + sign and put the size. In step 8 I have shown the + sign value. If you use the end value, then do not use the + sign.

Nosedragon Author

Level 1

0 points

Mar 27, 2015 4:49 PM in response to Loner T

did i do something wrong?

edit: Yes i did...i got it now....can I redo it?

Sudo gdisk /dev/disk0

Password:

GPT fdisk (gdisk) version 1.0.0

Warning: Devices opened with shared lock will not have their

partition table automatically reloaded!

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): 764C7856-DBFF-4D82-B7E9-26496AA9D8E6

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 11661077 sectors (5.6 GiB)

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

1 40 409639 200.0 MiB EF00 EFI System Partition

2 409640 558397919 266.1 GiB AF00 Macintosh SSD

3 558397920 559667455 619.9 MiB AB00 Recovery HD

4 571326464 976771071 193.3 GiB 0700 Microsoft basic data

Command (? for help): r

Recovery/transformation command (? for help): h

WARNING! Hybrid MBRs are flaky and dangerous! If you decide not to use one,

just hit the Enter key at the below prompt and your MBR partition table will

be untouched.

Type from one to three GPT partition numbers, separated by spaces, to be

added to the hybrid MBR, in sequence: 2 3 4

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): n

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

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

Enter an MBR hex code (default AB): y

Set the bootable flag? (Y/N):

Nosedragon Author

Level 1

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Mar 27, 2015 5:10 PM in response to Nosedragon

OK....

I opened a new terminal and did the MBR rebuild again...

first test: negative

following tests as well!

Loner T

Level 9

59,536 points

Mar 27, 2015 6:24 PM in response to Nosedragon

Nosedragon wrote:

Oh I am very sorry!!!

I totally forgot to tell that I changed partition size of the Macintosh Partition cause I read somewhere here that this might help...

but I didn't change it back so I have a small undefined part on my disk....

can I still do the procedure you explained?

Was the Macintosh HD Partition shrunk or extended?

Nosedragon Author

Level 1

0 points

Mar 27, 2015 11:06 PM in response to Loner T

I shrunk it from 292GB to 285GB

Loner T

Level 9

59,536 points

Mar 28, 2015 5:00 AM in response to Nosedragon

Can you check this partition?

D MS Data 433719265 839163872 405444608

Nosedragon Author

Level 1

0 points

Mar 30, 2015 1:05 AM in response to Loner T

TestDisk 7.0-WIP, Data Recovery Utility, March 2015

Christophe GRENIER <grenier@cgsecurity.org>

http://www.cgsecurity.org

MS Data 433719265 839163872 405444608

Can't open filesystem. Filesystem seems damaged.

Nosedragon Author

Level 1

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Mar 30, 2015 1:11 AM in response to Loner T

This is how it GPT looks like now....

sudo gpt -vv -r show /dev/disk0

Password:

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 557988280 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC

558397920 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

559667456 11659008

571326464 405444608 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

976771072 2063

976773135 32 Sec GPT table

976773167 1 Sec GPT header

and a new search I did 6h ago....

TestDisk 7.0-WIP, Data Recovery Utility, March 2015

Christophe GRENIER <grenier@cgsecurity.org>

http://www.cgsecurity.org

Disk /dev/rdisk0 - 500 GB / 465 GiB - 976773168 sectors (RO)

Partition Start End Size in sectors

P EFI System 40 409639 409600 [EFI]

D Mac HFS 409640 558397919 557988280

D Mac HFS 12125992 570114271 557988280

>D MS Data 433719265 839163872 405444608

D MS Data 436503201 841947808 405444608

D Mac HFS 558397920 559667455 1269536

D Mac HFS 570114272 571383807 1269536

D MS Data 571326464 976771071 405444608

D MS Data 571383808 976773119 405389312

D MS Data 578531259 578537432 6174

D MS Data 578537432 578543605 6174 [Boot]

D MS Data 578537451 578543624 6174

D MS Data 578543624 578549797 6174 [Boot]

D MS Data 578543643 578549816 6174

D MS Data 578549816 578555989 6174 [Boot]

D MS Data 578555992 578558871 2880 [EFISECTOR]

D MS Data 578558872 578561751 2880 [EFISECTOR]

D Mac HFS 580316100 588704709 8388610 [ D^A]

D MS Data 608137196 608142955 5760

D Mac HFS 608816208 608816302 95

D Mac HFS 664010245 664010339 95

D Mac HFS 664977397 664977491 95

D MS Data 786288772 786294531 5760

shall I try to rebuild GPT and MBR again so the gap closes??

Nosedragon Author

Level 1

0 points

Apr 9, 2015 1:44 AM in response to Nosedragon

Well...

I managed to save all my Data with NTFS Undelete and did a clean new installation of Bootcamp...

I also wrote to Apple to please fix this problem for future Software Versions!

But thank you so much for help and patience!

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Bootcamp not accessible after Yosemite update