Level 1

5 points

bootcamp partition renamed untitled after booting in MacOS

Can anybody please help me ?

I had succesfully installed Windows 10 on my Macbook Pro and ran Windows already several weeks smoothly.

Unfortunately I did not make a backup of my windows files yet.

Today when I booted to El Capitan to connect my iPad to iTunes Windows gave me a message that it needed repair when I tried to reboot to the bootcamp Windows version.

It did not succeed in repairing and only gave my an advanced options menu.

I booted back into MacOS to find that the windows partition was renamed to 'Untitled' and that no files were visible in Finder.

I than ran Disk Utility and selected First Aid on this partition, I thought this was read only to check for disk errors.

Now when booting from Windows it says no operation system available and Disk Utility shows 496 GB empty space on this partition !

I hope not all my files are lost !!

What can I do to repair the bootcamp partition ? I tried to install setup bootcamp files on USB but cannot boot from USB (does not show the USB drive)

thank you !

Olivier

MacBook Pro, OS X El Capitan (10.11.3), Bootcamp Windows 10

Posted on Apr 5, 2016 11:34 AM

297 replies

Loner T

Level 9

59,536 points

Apr 20, 2016 6:32 AM in response to ozeegers

Since both of these reside within the 185GB current partition, there is no harm in trying to repair this with /rebuildBCD. Please ensure that you backup the current BCD, before you make changes.

ozeegers Author

Level 1

5 points

Apr 20, 2016 6:47 AM in response to Loner T

Ok and I can backup bcd to c:?

ozeegers Author

Level 1

5 points

Apr 20, 2016 11:11 PM in response to ozeegers

ok, i tried, but no success....

can you tell me how we search the other windows installation ? in the other 250 GB section ?

tahnk you

Loner T

Level 9

59,536 points

Apr 21, 2016 6:36 AM in response to ozeegers

You will need to use Testdisk and run a Deeper Search.

ozeegers Author

Level 1

5 points

Apr 22, 2016 10:25 PM in response to Loner T

I found this one:

TestDisk 7.0, Data Recovery Utility, April 2015

Christophe GRENIER <grenier@cgsecurity.org>

http://www.cgsecurity.org

MS Data 1074524160 1464225791 389701632

Directory /

dr-xr-xr-x 0 0 0 21-Apr-2016 10:11 .

dr-xr-xr-x 0 0 0 21-Apr-2016 10:11 ..

dr-xr-xr-x 0 0 0 23-Jan-2016 09:03 $Recycle.Bin

dr-xr-xr-x 0 0 0 22-Jan-2016 18:37 $Windows.~WS

dr-xr-xr-x 0 0 0 23-Jan-2016 09:21 AMD

dr-xr-xr-x 0 0 0 21-Apr-2016 17:31 Boot

dr-xr-xr-x 0 0 0 22-Jan-2016 18:56 ESD

dr-xr-xr-x 0 0 0 19-Jan-2014 20:45 Intel

dr-xr-xr-x 0 0 0 10-Mar-2014 14:59 MSOCache

dr-xr-xr-x 0 0 0 30-Oct-2015 08:24 PerfLogs

dr-xr-xr-x 0 0 0 21-Apr-2016 20:32 Program Files

dr-xr-xr-x 0 0 0 21-Apr-2016 20:34 Program Files (x86)

dr-xr-xr-x 0 0 0 21-Apr-2016 20:34 ProgramData

dr-xr-xr-x 0 0 0 23-Jan-2016 00:33 Recovery

>dr-xr-xr-x 0 0 0 17-Apr-2016 20:50 System Volume Information

dr-xr-xr-x 0 0 0 23-Jan-2016 00:36 Users

dr-xr-xr-x 0 0 0 21-Apr-2016 10:08 Windows

dr-xr-xr-x 0 0 0 23-Jan-2016 09:20 inetpub

-r--r--r-- 0 0 36864 21-Apr-2016 17:30 BCD_Backup

-r--r--r-- 0 0 36864 21-Apr-2016 17:30 BCD_Backup.LOG

-r--r--r-- 0 0 0 21-Apr-2016 17:30 BCD_Backup.LOG1

-r--r--r-- 0 0 0 21-Apr-2016 17:30 BCD_Backup.LOG2

-r--r--r-- 0 0 1 30-Oct-2015 08:18 BOOTNXT

-r--r--r-- 0 0 8192 23-Jan-2016 00:04 BOOTSECT.BAK

-r--r--r-- 0 0 232960 7-Nov-2007 07:12 VC_RED.MSI

-r--r--r-- 0 0 1442522 7-Nov-2007 07:09 VC_RED.cab

-r--r--r-- 0 0 400302 29-Mar-2016 12:07 bootmgr

-r--r--r-- 0 0 1110 7-Nov-2007 07:00 globdata.ini

-r--r--r-- 0 0 3151020032 21-Apr-2016 07:42 hiberfil.sys

-r--r--r-- 0 0 562688 7-Nov-2007 07:03 install.exe

-r--r--r-- 0 0 843 7-Nov-2007 07:00 install.ini

-r--r--r-- 0 0 76304 7-Nov-2007 07:03 install.res.1028.dll

-r--r--r-- 0 0 96272 7-Nov-2007 07:03 install.res.1031.dll

-r--r--r-- 0 0 91152 7-Nov-2007 07:03 install.res.1033.dll

-r--r--r-- 0 0 97296 7-Nov-2007 07:03 install.res.1036.dll

-r--r--r-- 0 0 95248 7-Nov-2007 07:03 install.res.1040.dll

-r--r--r-- 0 0 81424 7-Nov-2007 07:03 install.res.1041.dll

-r--r--r-- 0 0 79888 7-Nov-2007 07:03 install.res.1042.dll

-r--r--r-- 0 0 75792 7-Nov-2007 07:03 install.res.2052.dll

-r--r--r-- 0 0 96272 7-Nov-2007 07:03 install.res.3082.dll

-r--r--r-- 0 0 4294967296 21-Apr-2016 07:42 pagefile.sys

-r--r--r-- 0 0 268435456 21-Apr-2016 07:42 swapfile.sys

-r--r--r-- 0 0 5686 7-Nov-2007 07:00 vcredist.bmp

ozeegers Author

Level 1

5 points

Apr 22, 2016 10:30 PM in response to ozeegers

when i look deeper into the files this is the same windows as we already restored....

ozeegers Author

Level 1

5 points

Apr 22, 2016 10:35 PM in response to ozeegers

although we repairs the bcd testdisk this gives this result, does this mean something ? number of heads/cylinders mismatches ?

Disk /dev/disk0 - 750 GB / 698 GiB - 1465149168 sectors (RO)

Current partition structure:

Partition Start End Size in sectors

1 P EFI System 40 409639 409600 [EFI System]

2 P Mac HFS 409640 538608447 538198808 [Apple HFS/HFS+]

3 P Mac Boot 538608448 539877983 1269536 [Recovery HD]

Warning: number of heads/cylinder mismatches 255 (NTFS) != 1 (HD)

Warning: number of sectors per track mismatches 63 (NTFS) != 1 (HD)

4 P MS Data 1074524160 1464225791 389701632 [Microsoft basic data]

ozeegers Author

Level 1

5 points

Apr 22, 2016 11:11 PM in response to ozeegers

it also says the following partitions can't be recovered

Loner T

Level 9

59,536 points

Apr 23, 2016 6:50 AM in response to ozeegers

This was the only viable Windows header that we found using Testdisk. If your current recovered partition size is 185GB but you have a 470+ GB that you had, it indicates there was partition resizing executed. The issue you now have is related to the recoverability of the header which may correspond to the larger partition. Do you want run Testdisk again? Is it possible that you had a shared partition?

ozeegers Author

Level 1

5 points

Apr 23, 2016 8:09 AM in response to Loner T

I am quite certain that I did not repartition the disk. I would not know how to do it... I remember I could read the windows files in OS X and vice versa, does this mean I had a shared partition ?

I am still running testdisk on another portion but I get the idea I keep getting out on that one Windows installation....

Loner T

Level 9

59,536 points

Apr 23, 2016 8:53 AM in response to ozeegers

1. You original MBR was

*4: 07 1023 254 63 - 1023 254 63 [ 539879424 - 925265920] HPFS/QNX/AUX

2. Your GPT was corrupt. The GPT Fdisk showed

4 539877984 1464886983 441.1 GiB 0700 DOS_FAT_32_Untitled_2

There is a discrepancy here.

3. The GPT was rebuilt using the information from GPT Fdisk.

n

4

539877984

1464886983

0700

4. We can try the setup in the MBR and see what it yields.

ozeegers Author

Level 1

5 points

Apr 23, 2016 10:25 AM in response to Loner T

ok, can you guide me on how to do this ?

ozeegers Author

Level 1

5 points

Apr 23, 2016 10:28 AM in response to Loner T

this is nothing because its only 6174 sectors ?

TestDisk 7.0, Data Recovery Utility, April 2015

Christophe GRENIER <grenier@cgsecurity.org>

http://www.cgsecurity.org

MS Data 565200272 565206445 6174 [Boot]

Directory /

>dr-xr-xr-x 0 0 0 15-Feb-2005 22:33 .

dr-xr-xr-x 0 0 0 15-Feb-2005 22:33 ..

dr-xr-xr-x 0 0 0 15-Feb-2005 22:33 System Volume Information

Loner T

Level 9

59,536 points

Apr 23, 2016 10:38 AM in response to ozeegers

Can you use Re: El Capitan has deleted my bootcamp windows partition as a reference and modify the values in first set, in steps 7 and 8 to 539879424 and 925265920 respectively and test?

ozeegers Author

Level 1

5 points

Apr 23, 2016 12:10 PM in response to Loner T

Hello Loner T,

I did the things mentioned above, but halas, the drive is not showing up in finder nor is it visible as startup disk.

Was this the last possible option ?

I'd better format the whole disk and put El Capitan on it and then bootcamp ?

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bootcamp partition renamed untitled after booting in MacOS