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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

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Apr 6, 2016 11:28 PM in response to Loner T

Veerles-MBP:~ vclaeys$ sudo gpt -vv -r show /dev/disk0

Password:

gpt show: /dev/disk0: mediasize=750156374016; sectorsize=512; blocks=1465149168

gpt show: /dev/disk0: Suspicious MBR at sector 0

gpt show: /dev/disk0: Pri GPT at sector 1

gpt show: error: bogus map

gpt show: unable to open device '/dev/disk0': Undefined error: 0

Veerles-MBP:~ vclaeys$

ozeegers Author

Level 1

5 points

Apr 6, 2016 11:39 PM in response to ozeegers

Succesfully disabled System Integrity Protection. Please restart the machine for the changes to take effect.

ozeegers Author

Level 1

5 points

Apr 6, 2016 11:43 PM in response to ozeegers

I probably need to run the following again: sudo gdisk /dev/rdisk0

but I'll wait your reply just to make sure not to make mistakes....

ozeegers Author

Level 1

5 points

Apr 8, 2016 2:07 AM in response to Loner T

Hi Loner T,

Can I let this command run safely to repair the GPT ?

sudo gdisk /dev/rdisk0

thank, Olivier

Loner T

Level 9

59,536 points

Apr 8, 2016 9:40 AM in response to ozeegers

Yes, but if you are able to run Gdisk and see a proper GPT, remember to write it, so the CRC issue will be fixed.

ozeegers Author

Level 1

5 points

Apr 8, 2016 10:51 AM in response to Loner T

ok, I get this output:

GPT fdisk (gdisk) version 1.0.1

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):

Loner T

Level 9

59,536 points

Apr 8, 2016 10:58 AM in response to ozeegers

Run 'p'(rint), 'w'(rite), and 'y'(es to confirm) and then retry the gpt command.

ozeegers Author

Level 1

5 points

Apr 8, 2016 11:13 AM in response to Loner T

Command (? for help): p

Disk /dev/rdisk0: 1465149168 sectors, 698.6 GiB

Logical sector size: 512 bytes

Disk identifier (GUID): 0000324C-0DFF-0000-ED08-0000FD0D0000

Partition table holds up to 128 entries

First usable sector is 34, last usable sector is 1465149134

Partitions will be aligned on 8-sector boundaries

Total free space is 262157 sectors (128.0 MiB)

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

1 40 409639 200.0 MiB EF00 EFI system partition

2 409640 538608447 256.6 GiB AF00 Customer

3 538608448 539877983 619.9 MiB AB00 Recovery HD

4 539877984 1464886983 441.1 GiB 0700 DOS_FAT_32_Untitled_2

Command (? for help):

Command (? for help): w

Warning! Mismatched GPT and MBR partition! MBR partition 4, of type 0x07,

has no corresponding GPT partition! You may continue, but this condition

might cause data loss in the future!

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING

PARTITIONS!!

Do you want to proceed? (Y/N): y

OK; writing new GUID partition table (GPT) to /dev/rdisk0.

Warning: Devices opened with shared lock will not have their

partition table automatically reloaded!

Warning: The kernel may continue to use old or deleted partitions.

You should reboot or remove the drive.

The operation has completed successfully.

rerun of got command:

Veerles-MBP:~ vclaeys$ sudo gdisk /dev/rdisk0

Password:

GPT fdisk (gdisk) version 1.0.1

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):

Loner T

Level 9

59,536 points

Apr 8, 2016 11:40 AM in response to ozeegers

Can you post the output of

sudo gpt -vv -r show /dev/disk0

ozeegers Author

Level 1

5 points

Apr 8, 2016 11:50 AM in response to Loner T

looks not good:

Veerles-MBP:~ vclaeys$ sudo gpt -vv -r show /dev/disk0

Password:

gpt show: /dev/disk0: mediasize=750156374016; sectorsize=512; blocks=1465149168

gpt show: /dev/disk0: Suspicious MBR at sector 0

gpt show: /dev/disk0: Pri GPT at sector 1

gpt show: error: bogus map

gpt show: unable to open device '/dev/disk0': Undefined error: 0

i quit disk with 'q' quit without saving changes... was that not right ?

Loner T

Level 9

59,536 points

Apr 8, 2016 12:05 PM in response to ozeegers

Can you reboot and check the command output?

ozeegers Author

Level 1

5 points

Apr 8, 2016 12:58 PM in response to Loner T

WHen I boot it says no operating system

when i boot from cd there is an option to reset the pc and keep files bUT scary !

what to do?

all my e-mails in Outlook Will be gone

Loner T

Level 9

59,536 points

Apr 8, 2016 1:28 PM in response to ozeegers

We should not try and boot into Windows yet. Let us first address the GPT issue. Do not reset the PC till we come to that point and all other avenues have been exhausted.

ozeegers Author

Level 1

5 points

Apr 8, 2016 1:34 PM in response to Loner T

Okay

ozeegers Author

Level 1

5 points

Apr 9, 2016 3:44 AM in response to Loner T

thank you so much for your help, very much appreciated !!

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bootcamp partition renamed untitled after booting in MacOS