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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

Loner T

Level 9

59,536 points

Mar 25, 2015 2:42 PM in response to Nosedragon

The size of 6174 sectors (~3MB) is too small to hold Windows. It has that file, because it is a volume by itself.

Nosedragon Author

Level 1

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Mar 25, 2015 2:48 PM in response to Loner T

So rebuilding the GPT4 would not change anything?

Or is there another method?

Loner T

Level 9

59,536 points

Mar 25, 2015 3:00 PM in response to Nosedragon

1. Can you check those following partitions?

MS Data 433719265 839163872 405444608

MS Data 436503201 841947808 405444608

2. Are there any partitions further down which are MS Data?

Nosedragon Author

Level 1

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Mar 25, 2015 3:29 PM in response to Loner T

both show:

TestDisk 6.14, Data Recovery Utility, July 2013

Christophe GRENIER <grenier@cgsecurity.org>

http://www.cgsecurity.org

MS Data 433719265 839163872 405444608

Can't open filesystem. Filesystem seems damaged.

Loner T

Level 9

59,536 points

Mar 25, 2015 3:37 PM in response to Nosedragon

Do you any more in the list which are MS Data of this size?

Nosedragon Author

Level 1

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Mar 25, 2015 3:40 PM in response to Loner T

no :-(

just these 4

MS Data 433719265 839163872 405444608

> MS Data 436503201 841947808 405444608

MS Data 571326464 976771071 405444608 [BOOTCAMP]

MS Data 571383808 976773119 405389312

Loner T

Level 9

59,536 points

Mar 25, 2015 4:03 PM in response to Nosedragon

The triplet you see in Testdisk are start/end/size. If we assume that your first 6174 entry is the correct start of NTFS, we get the following table.

GPT 3 Start	GPT 3 Size	GPT 3 End	NTFS Start	Sector Offset	NTFS Size	NTFS End	Sector Offset (MB)
558397920	1269536	559667456	578537432	18869976	405444608	983982040	9213.855469
558397920	1269536	559667456	578537432	18869976	405389312	983926744	9213.855469

I have assumed the same start and used bot size values.

The problem with this is that your disk is 976773168 sectors. If you look at NTFS End value, it is beyond number of sectors you have on the full disk. This makes either start values unusable.

We can try it and force the end to be 976773120 which came from your GPT output. The 15 bytes can be consumed which will make the end to be 976773120 which is one byte before the secondary GPT entry.

Nosedragon Author

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Mar 25, 2015 4:16 PM in response to Loner T

So what shall I do now?

open another terminal?

but isn't right?

my disk is 976773168 sectors and the 2nd part ends at 976773119

that fits..!?

Loner T

Level 9

59,536 points

Mar 25, 2015 4:22 PM in response to Nosedragon

If you are referring to this entry

MS Data 571383808 976773119 405389312

it is the same as the following

571383808 405389312 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

This entry is not working for you.

Nosedragon Author

Level 1

0 points

Mar 25, 2015 4:28 PM in response to Loner T

so there is actually no real part in size that could be the gap between GPT3 and GPT4..?

What can I do? Or rather how do I do it?

Loner T

Level 9

59,536 points

Mar 25, 2015 4:32 PM in response to Nosedragon

Do you have files in your BC partition that you need to save?

Nosedragon Author

Level 1

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Mar 25, 2015 4:44 PM in response to Loner T

Yes definitely.

Most important are files like Outlook and from other saving from CAD software.

Loner T

Level 9

59,536 points

Mar 25, 2015 5:04 PM in response to Nosedragon

You can try PhotoRec (which is downloaded as part of Testdisk). You may not get proper file names.

Nosedragon Author

Level 1

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Mar 25, 2015 5:10 PM in response to Loner T

in photorec i choose >Disk /dev/rdisk0 - 500 GB / 465 GiB (RO)

and search on the 4th partition which is named BOOTCAMP?

(disk1 is a second ssd in this current MBP)

PhotoRec 6.14, Data Recovery Utility, July 2013

Christophe GRENIER <grenier@cgsecurity.org>

http://www.cgsecurity.org

PhotoRec is free software, and

comes with ABSOLUTELY NO WARRANTY.

Select a media (use Arrow keys, then press Enter):

Disk /dev/disk0 - 500 GB / 465 GiB (RO)

Disk /dev/disk1 - 500 GB / 465 GiB (RO)

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

Disk /dev/rdisk1 - 500 GB / 465 GiB (RO)

Nosedragon Author

Level 1

0 points

Mar 25, 2015 5:11 PM in response to Loner T

what do I choose?

PhotoRec 6.14, Data Recovery Utility, July 2013

Christophe GRENIER <grenier@cgsecurity.org>

http://www.cgsecurity.org

4 P MS Data 571383808 0 1 976773119 0 1 405389312 [BOOTCAMP]

To recover lost files, PhotoRec need to know the filesystem type where the

file were stored:

[ ext2/ext3 ] ext2/ext3/ext4 filesystem

>[ Other ] FAT/NTFS/HFS+/ReiserFS/...

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Bootcamp not accessible after Yosemite update