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

ozeegers Author

Level 1

5 points

Apr 16, 2016 7:19 AM in response to Loner T

ok, I assigned the letter Z to volume 2

When I exit diskpart and get a dir op Z: there's no files

I presume I continue with these commands now ? :

bcdedit /export C:\BCD_Backup
c:
cd boot
attrib bcd -s -h -r
ren c:\boot\bcd bcd.old
bootrec /RebuildBcd

Loner T

Level 9

59,536 points

Apr 16, 2016 7:26 AM in response to ozeegers

First, let us look at the contents of the EFI partition. Try these....

cd Z:

dir/p

ozeegers Author

Level 1

5 points

Apr 16, 2016 7:57 AM in response to Loner T

file not found...

Loner T

Level 9

59,536 points

Apr 16, 2016 8:21 AM in response to ozeegers

Too many OSes in my head. Try

dir/p

ozeegers Author

Level 1

5 points

Apr 16, 2016 8:52 AM in response to Loner T

same result....

Loner T

Level 9

59,536 points

Apr 16, 2016 8:56 AM in response to ozeegers

Type dir and see what you get.

ozeegers Author

Level 1

5 points

Apr 16, 2016 9:50 AM in response to Loner T

gives exactly the same ?

Loner T

Level 9

59,536 points

Apr 16, 2016 10:09 AM in response to ozeegers

Boot into OSX and follow Re: Can't resize Macintosh HD partition and mount the Mac's EFI and check if there is a Microsoft directory.

ozeegers Author

Level 1

5 points

Apr 16, 2016 10:27 AM in response to Loner T

I get an error with the mount command ?

Last login: Sat Apr 16 19:23:11 on ttys000

Veerles-MBP:~ vclaeys$ sudo mkdir -p /Volumes/EFI

Password:

Veerles-MBP:~ vclaeys$ sudo mount -t msdos /dev/disk0S1/Volumes/EFI

usage: mount [-dfruvw] [-o options] [-t external_type] special node

mount [-adfruvw] [-t external_type]

mount [-dfruvw] special | node

Veerles-MBP:~ vclaeys$ sudo mount -t msdos /dev/disk0s1/Volumes/EFI

usage: mount [-dfruvw] [-o options] [-t external_type] special node

mount [-adfruvw] [-t external_type]

mount [-dfruvw] special | node

Veerles-MBP:~ vclaeys$

Loner T

Level 9

59,536 points

Apr 16, 2016 10:30 AM in response to ozeegers

You need a space between "/disk0s1" and "/Volume" .

ozeegers Author

Level 1

5 points

Apr 16, 2016 10:42 AM in response to Loner T

ok, output:

Veerles-MBP:~ vclaeys$ ls -lR /Volumes/EFI

total 3

-rwxrwxrwx 1 vclaeys staff 660 Apr 11 05:31 BOOTLOG

drwxrwxrwx 1 vclaeys staff 512 Sep 17 2011 EFI

/Volumes/EFI/EFI:

total 1

drwxrwxrwx 1 vclaeys staff 512 Sep 18 2011 APPLE

/Volumes/EFI/EFI/APPLE:

total 2

drwxrwxrwx 1 vclaeys staff 512 Sep 17 2011 EXTENSIONS

drwxrwxrwx 1 vclaeys staff 512 Jan 23 04:37 FIRMWARE

/Volumes/EFI/EFI/APPLE/EXTENSIONS:

total 30722

-rwxrwxrwx 1 vclaeys staff 15729264 Apr 16 19:24 Firmware.scap

/Volumes/EFI/EFI/APPLE/FIRMWARE:

total 16514

-rwxrwxrwx 1 vclaeys staff 8454768 Jan 23 04:37 MBP81_0047_2CB_LOCKED.scap

Veerles-MBP:~ vclaeys$

ozeegers Author

Level 1

5 points

Apr 16, 2016 12:28 PM in response to ozeegers

is BOOTLOG a microsoft file ? is EFI a microsoft DIR ?

should I mount ./Volumes/EFI via Diskutility ?

Loner T

Level 9

59,536 points

Apr 16, 2016 12:56 PM in response to ozeegers

Your Firmware version file indicates your Mac is a MacbookPro 8,1, which is one of these.

MacBook Pro (13-inch, Late 2011)

MacBookPro8,1

MD314xx/A

MD313xx/A

13.3"/2.8 i7/2x2GB/750-5400

13.3"/2.4 i5/2x2GB/500-5400

MacBook Pro (13-inch, Early 2011)

MacBookPro8,1

MC724xx/A

13.3"/2.7 i7/2x2GB/500-5400

MC700xx/A

13.3"/2.3 i5/2x2GB/320-5400

but if you have a 17-inch Early 2011, it should be a MacbookPro 8,3

MacBook Pro (17-inch, Early 2011)

MacBookPro8,3

MC725xx/A

17"/2.2 Quad-core i7/2x2GB/750-5400

The 2011 models do not support Windows EFI installations, so your installation is a legacy BIOS/MBR installation, hence there is no Microsoft structure, as shown in the link I provided earlier. Your BCD is in C:. Try to rebuild the BCD in C: and test if it corrects the issue.

Please check C:\Boot and you should see files like

ls -lg

total 1216

-rwxr-xr-x@ 1 staff 28672 Feb 27 19:36 BCD

-rwxr-xr-x@ 1 staff 25600 Feb 27 19:26 BCD.LOG

prwxr-xr-x@ 2 staff 0 Feb 10 2014 BCD.LOG1

prwxr-xr-x@ 2 staff 0 Feb 10 2014 BCD.LOG2

-rwxr-xr-x@ 1 staff 65536 Feb 10 2014 BOOTSTAT.DAT

drwxr-xr-x 1 staff 0 Feb 10 2014 Fonts

drwxr-xr-x 1 staff 0 Apr 3 2015 cs-CZ

drwxr-xr-x 1 staff 0 Apr 3 2015 da-DK

drwxr-xr-x 1 staff 0 Apr 3 2015 de-DE

drwxr-xr-x 1 staff 0 Apr 3 2015 el-GR

drwxr-xr-x 1 staff 0 Apr 3 2015 en-US

drwxr-xr-x 1 staff 0 Apr 3 2015 es-ES

drwxr-xr-x 1 staff 0 Apr 3 2015 fi-FI

drwxr-xr-x 1 staff 0 Apr 3 2015 fr-FR

drwxr-xr-x 1 staff 0 Apr 3 2015 hu-HU

drwxr-xr-x 1 staff 0 Apr 3 2015 it-IT

drwxr-xr-x 1 staff 0 Apr 3 2015 ja-JP

drwxr-xr-x 1 staff 0 Apr 3 2015 ko-KR

-rwxr-xr-x 1 staff 497080 Feb 2 2015 memtest.exe

drwxr-xr-x 1 staff 0 Apr 3 2015 nb-NO

drwxr-xr-x 1 staff 0 Apr 3 2015 nl-NL

drwxr-xr-x 1 staff 0 Apr 3 2015 pl-PL

drwxr-xr-x 1 staff 0 Apr 3 2015 pt-BR

drwxr-xr-x 1 staff 0 Apr 3 2015 pt-PT

drwxr-xr-x 1 staff 0 Apr 3 2015 ru-RU

drwxr-xr-x 1 staff 0 Apr 3 2015 sv-SE

drwxr-xr-x 1 staff 0 Apr 3 2015 tr-TR

drwxr-xr-x 1 staff 0 Apr 3 2015 zh-CN

drwxr-xr-x 1 staff 0 Apr 3 2015 zh-HK

drwxr-xr-x 1 staff 0 Apr 3 2015 zh-TW

ozeegers Author

Level 1

5 points

Apr 16, 2016 1:04 PM in response to Loner T

so i continue with this:

bcdedit /export C:\BCD_Backup
c:
cd boot
attrib bcd -s -h -r
ren c:\boot\bcd bcd.old
bootrec /RebuildBcd

if this command not dangerous : bcdedit /export C:\BCD_Backup

because we are writing to C ?

I cannot export this backup file to external disk ?

Loner T

Level 9

59,536 points

Apr 16, 2016 1:09 PM in response to ozeegers

Yes, this will work. Please verify that you can see a BCD file in the Boot directory on C: .

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bootcamp partition renamed untitled after booting in MacOS