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

May 1, 2016 9:20 AM in response to Loner T

OK, I uploaded to wetransfer:

sudo dd if=/dev/rdisk0s4 bs=512 count=1440 of=mbr2.bin

https://we.tl/EIypHwLDO6

ozeegers Author

Level 1

5 points

May 2, 2016 12:47 AM in response to ozeegers

its around 700 kB, did you make a mistake when saying 700 Mb ? or did I do something wrong again ?

Loner T

Level 9

59,536 points

May 2, 2016 5:32 AM in response to ozeegers

You are correct, it is 700Kb.

ozeegers Author

Level 1

5 points

May 2, 2016 8:11 AM in response to Loner T

OK, I uploaded to wetransfer:

sudo dd if=/dev/rdisk0s4 bs=512 count=1440 of=mbr2.bin

https://we.tl/EIypHwLDO6

ozeegers Author

Level 1

5 points

May 3, 2016 11:14 PM in response to ozeegers

still traveling ?

Loner T

Level 9

59,536 points

May 4, 2016 6:03 AM in response to ozeegers

I should get a chance later today to look. Thanks for being patient. 😉

ozeegers Author

Level 1

5 points

May 6, 2016 1:50 PM in response to Loner T

If the we transfer does not work anymore let me know.. I will upload again

Loner T

Level 9

59,536 points

May 6, 2016 3:29 PM in response to ozeegers

Can you post the output of

sudo gpt -vv -r show /dev/disk0

ozeegers Author

Level 1

5 points

May 6, 2016 10:45 PM in response to Loner T

did you download the mbr2.bin file via wetransfer ? nothing there ?

output of sudo gpt -vv -r show /dev/disk0:

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: /dev/disk0: Sec GPT at sector 1465149167

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 538198808 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC

538608448 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

539877984 1440

539879424 925265920 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

1465145344 3791

1465149135 32 Sec GPT table

1465149167 1 Sec GPT header

Loner T

Level 9

59,536 points

May 7, 2016 6:48 AM in response to ozeegers

On page 2, you have...

4 539877984 1464886983 441.1 GiB 0700 DOS_FAT_32_Untitled_2

We chose ( at Re: bootcamp partition renamed untitled after booting in MacOS ) to use

D MS Data 539879424 1465145343 925265920

This introduced the gap of 1440 sectors. Can change your GPT to the original one? Do not use 07, but try to use 0B or 0C.

ozeegers Author

Level 1

5 points

May 8, 2016 1:28 AM in response to Loner T

did that with 0B but nothing visible in finder....

output:

Disk /dev/rdisk0: 1465149168 sectors, 698.6 GiB

Logical sector size: 512 bytes

Disk identifier (GUID): BE924D70-1CD5-4EDB-9B44-947B2100D347

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

2 409640 538608447 256.6 GiB AF00 Apple HFS/HFS+

3 538608448 539877983 619.9 MiB AB00 Recovery HD

4 539877984 1464886983 441.1 GiB AF00 Apple HFS/HFS+

ozeegers Author

Level 1

5 points

May 8, 2016 1:08 PM in response to ozeegers

should we give up?

Loner T

Level 9

59,536 points

May 8, 2016 1:47 PM in response to ozeegers

ozeegers wrote:

4 539877984 1464886983 441.1 GiB AF00 Apple HFS/HFS+

and

4 539877984 1464886983 441.1 GiB 0700 DOS_FAT_32_Untitled_2

do not match. Can you update the GPT with 07, 0B and 0C and check each?

ozeegers Author

Level 1

5 points

May 9, 2016 5:11 AM in response to Loner T

When I enter 0700 I get partition untitled visible in finder but no files..what do I need to enter for 0B and 0C?

ozeegers Author

Level 1

5 points

May 9, 2016 6:27 AM in response to ozeegers

when I use 0B00 it says 0700 as code in gdisk P command as well ? It does not accept 0Bh

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bootcamp partition renamed untitled after booting in MacOS