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Question: gDisk Erased Bootcamp Partition After Repair Attempt

I'm running MacOS Sierra 10.12 and Windows 10 Build 10240 on 750GB disk.


Without doing proper research, I stupidly used Disk Utility to add a new 139GB partition to the same disk that had MacOS and Bootcamp and made the filesystem as ExFat because I wanted both my MacOS and Windows to be able to read and write to it.



Lo and behold, Boot Camp was no longer functioning. Whilst MacOS still boots, the Boot Camp partition now no longer showed up in the Startup boot option menu, though it did in the Disk Utlility and on the MacOS desktop. Attempting to boot straight off of bootcamp showed the following message:

No bootable device --- insert boot disk and press any key



So I followed this tutorial:

http://nerdr.com/bootcamp-partition-lost-repairing-mac-partitions/



I already know I may have made a mistake because I was using that tutorial and an answer from another apple forum post (https://discussions.apple.com/message/19071422#19071422). The nerdr tutorial in the link above says to use gptfdisk and I was using the terminal app gdisk based on the answer in the apple forum.



After following the procedure exactly, however, it had all the same menu options so I didn't know if there is a difference. After I was done, Bootcamp was completely erased. Now here's what gdisk shows as my new partition table:



Command (? for help): p

Disk /dev/disk0: 1465149168 sectors, 698.6 GiB

Sector size (logical): 512 bytes

Disk identifier (GUID): DC08A243-0BDF-4D84-870F-044744CBFD1A

Partition table holds up to 128 entries

Main partition table begins at sector 2 and ends at sector 33

First usable sector is 34, last usable sector is 1465149134

Partitions will be aligned on 8-sector boundaries

Total free space is 70891845 sectors (33.8 GiB)



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

1 40 409639 200.0 MiB EF00 EFI System Partition

2 409640 1100019007 524.3 GiB AF00

3 1100019008 1101288543 619.9 MiB AB00

4 1101288544 1392987759 139.1 GiB 0700

5 1392987760 1394257295 619.9 MiB AB00 Recovery HD



I think the data is still probably there, it is now just missing on the partition table. As you can see, the Recovery HD disk ends on sector 1394257295 and the last available sector is 1465149134. It says there is 33.8gb of free space, and the Windows bootcamp partition was around 39gb if I remember correctly.



I don't have anything backed up or have time machine running.



I thought restoring the partition I made back to the original partition may fix. I was not able to restore the ExFat partition back to the 750GB hard drive. I get message "Restore Process Has Failed" and the following list of commands:

Validating target...

Validating source...

Repartitioning target device...

Source volume is read-write and cannot be unmounted, so it can't be block copied.

Operation failed…



I get the above message over and over, even after unmounting it, reformatting the file system as MacOS journaled, and so on. Lastly I don't know if bootcamp was booting using MBR or GPT, but the disk did have a windows folder on it if that helps.



So, is there a way to recover the bootcamp partition, without messing up my harddrive, and while keeping my 139.1 GB ExFat partition?

MacBook Pro, macOS Sierra (10.12), Bootcamp Windows 10 RTM Build 10240

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Nov 14, 2017 7:51 PM in response to Mutant_Bunny In response to Mutant_Bunny

The Nerdr link is a terrible link to follow. It overwrites a working MBR with a corrupted GPT. The second post is useful in a specific situation, and should not be applied universally, otherwise you can cause more issues as you have already experienced.


Post the output of


diskutil list

diskutil cs list


What is the year/model of your Mac?

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Question marked as Helpful

Nov 14, 2017 7:51 PM in response to Mutant_Bunny In response to Mutant_Bunny

The Nerdr link is a terrible link to follow. It overwrites a working MBR with a corrupted GPT. The second post is useful in a specific situation, and should not be applied universally, otherwise you can cause more issues as you have already experienced.


Post the output of


diskutil list

diskutil cs list


What is the year/model of your Mac?

Nov 14, 2017 7:51 PM

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Nov 14, 2017 7:47 PM in response to Loner T In response to Loner T

diskutil list:


#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *750.2 GB
disk0

1: EFI EFI 209.7 MB
disk0s1

2: Apple_HFS 750GB HD 563.0 GB
disk0s2

3: Apple_Boot Recovery HD 650.0 MB
disk0s3

4: Microsoft Basic Data TD 149.4 GB
disk0s4

5: Apple_Boot 650.0 MB
disk0s5

diskutil cs list:

No CoreStorage logical volume groups found

Nov 14, 2017 7:47 PM

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Nov 15, 2017 8:09 AM in response to Loner T In response to Loner T

I don't know... I bought the Macbook from someone who had already had bootcamp and MacOS setup.


I don't recall that 2nd recovery drive being there before the partition map got messed up... and there were 5 partitions at that time (one of them being Bootcamp), now there are still 5.

I have a mid-2012 Macbook pro 13" Model No. A1278 (EMC 2554*).


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Nov 15, 2017 8:09 AM

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Nov 15, 2017 11:41 AM in response to Mutant_Bunny In response to Mutant_Bunny

This is an exFAT header. The Nerder overwrote a possibly valid MBR and the only way to try a recovery is to run Testdisk. See El Capitan has deleted my bootcamp windows partition as an example for running Testdisk.

Nov 15, 2017 11:41 AM

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Question: gDisk Erased Bootcamp Partition After Repair Attempt