I Corrupted my Boot Partition from deleting a new Mac partition on windows

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I Corrupted my Boot Partition from deleting a new Mac partition on windows

Please Help, I apologize for making this long, just want to make sure I mention everything, and why I did what I did.

So I have my Macbook Bootcamped with Windows for gaming with my EGPU, When I originally setup the partitions I gave windows about 50GB as I have all my games installed on a External SSD. Anyways I was installing some Oculus Software which requires that you MUST install the software on the OS Hard drive, and couldn't be installed on any external drives due to drivers. however I at the time had about only 7 GB available on the partition, and I needed 18 GB. So my thinking was I needed to expand my Bootcamp partition, However MacOS doesn't let you just grow the volume, it requires you to reformat Bootcamp and reinstall everything and I didn't wanna wipe my windows disk. So instead I went into Mac OS and from my Macintosh Volume I created a New 24 GB APFS Partition, thinking I can reformat it back in windows and grow the volume. However after booting into Windows and reformatting the partition with some 3rd party software It wouldn't let me merge the unallocated space with my bootcamp partition. So Instead I created a new NTFS Volume and then was able to install the oculus software on that partition. However after setting everything up and rebooting I was only greeted with a Windows Boot and No option to boot into Macintosh. I can boot into Internet Recovery Mode, but I really need some of my data I have on my Mac Partition as It has School/Work Projects so I'm trying to push off wiping the whole drive and reinstalling Mac again. I tried to see if it would let me reinstall with keeping my files, but the installer wouldn't detect my old Macintosh Partition. If you have any questions or ideas please reach out to me ASAP.

P.S. I had Mac OS installed with FileVault, I'm not sure if that changes if I can recover my data or not.

Kindest Regards, Collin.

MacBook Pro 15", macOS 10.14

Posted on Apr 10, 2019 11:46 PM

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Answer 1

Loner T

Level 9

59,536 points

Apr 12, 2019 5:10 PM in response to coli9m

Can you post the output of

sudo dd if=/dev/rdisk0s2 count=10 2>/dev/null | hexdump -C

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Answer 2

Loner T

Level 9

59,536 points

Apr 12, 2019 6:16 AM in response to coli9m

My recommendation is

How to reinstall macOS from macOS Recovery - Apple Support on an external disk
Boot from the external disk and upgrade it to match the last good macOS version you had on the internal disk
From Terminal, post the output of
- diskutil list before we go further

If you have a second Mac which has the same version as the non-working Mac, we can also use Use target disk mode to move files to another computer - Apple Support to connect the two Macs and try to Repair the non-working Mac.

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Answer 3

Loner T

Level 9

59,536 points

Apr 12, 2019 3:28 PM in response to coli9m

You can post Terminal output as simple text or as a Text attachment using the Text icon at the bottom of the reply box.

Post the output of

sudo gpt -vv -r show /dev/disk0

sudo dd if=/dev/rdisk0s2 count=5 2>/dev/null | hexdump -C

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Answer 4

Loner T

Level 9

59,536 points

Apr 11, 2019 7:05 AM in response to coli9m

Can you post the current disk partition layout using

diskutil list

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Answer 5

Loner T

Level 9

59,536 points

Apr 13, 2019 1:56 AM in response to coli9m

Since we do not see any headers for disk0s2, the data may be unrecoverable.

If you

have a Time Machine backup, you can erase the internal disk, and restore from TM, or,
can re-install macOS, and then,
can re-install Windows

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Answer 6

coli9m Author

Level 1

8 points

Apr 12, 2019 3:49 PM in response to Loner T

Collins-MacBook-Pro:~ snow$ sudo gpt -vv -r show /dev/disk0
gpt show: /dev/disk0: mediasize=251000193024; sectorsize=4096; blocks=61279344
gpt show: /dev/disk0: PMBR at sector 0
gpt show: /dev/disk0: Pri GPT at sector 1
gpt show: /dev/disk0: Sec GPT at sector 61279343
     start      size  index  contents
         0         1         PMBR
         1         1         Pri GPT header
         2         4         Pri GPT table
         6     76800      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
     76806  43213086      2  GPT part - DE94BBA4-06D1-4D40-A16A-BFD50179D6AC
  43289892   6103516         
  49393408  11885824      3  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
  61279232       107         
  61279339         4         Sec GPT table
  61279343         1         Sec GPT header
Collins-MacBook-Pro:~ snow$ sudo dd if=/dev/rdisk0s2 count=5 2>/dev/null | hexdump -C
Collins-MacBook-Pro:~ snow$

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Answer 7

coli9m Author

Level 1

8 points

Apr 11, 2019 2:11 PM in response to Loner T

Thanks for the response! Here you go

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Answer 8

Loner T

Level 9

59,536 points

Apr 11, 2019 5:36 PM in response to coli9m

You have a 177GB Windows RE, which is incorrect. The most likely culprit is the third-party tool. Also, from the Windows side, there is no way to distinguish between two APFS containers.

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Answer 9

coli9m Author

Level 1

8 points

Apr 11, 2019 8:31 PM in response to Loner T

So in other words am I going to have to reformat my entire HD including windows?

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Answer 10

coli9m Author

Level 1

8 points

Apr 12, 2019 3:17 PM in response to Loner T

Installed Mac on my external drive, looks like it still thinks it’s windows recovery :/

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Answer 11

Loner T

Level 9

59,536 points

Apr 13, 2019 5:11 PM in response to Loner T

Please post back once you start the Recovery and run into any issues.

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Answer 12

coli9m Author

Level 1

8 points

Apr 12, 2019 5:59 PM in response to Loner T

Collins-MacBook-Pro:~ snow$ sudo dd if=/dev/rdisk0s2 count=10 2>/dev/null | hexdump -C
Collins-MacBook-Pro:~ snow$

I don't get any output

Here's the "diskutil list" output if this makes referring back to the list easier

Collins-MacBook-Pro:~ snow$ diskutil list
/dev/disk0 (internal):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                         251.0 GB   disk0
   1:                        EFI EFI                     314.6 MB   disk0s1
   2:           Windows Recovery                         177.0 GB   disk0s2
   3:       Microsoft Basic Data BOOTCAMP                48.7 GB    disk0s3


/dev/disk1 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *63.5 GB    disk1
   1:                        EFI EFI                     209.7 MB   disk1s1
   2:                 Apple_APFS Container disk2         63.3 GB    disk1s2


/dev/disk2 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +63.3 GB    disk2
                                 Physical Store disk1s2
   1:                APFS Volume Mac                     21.8 GB    disk2s1
   2:                APFS Volume Preboot                 48.0 MB    disk2s2
   3:                APFS Volume Recovery                522.7 MB   disk2s3
   4:                APFS Volume VM                      8.6 GB     disk2s4


Collins-MacBook-Pro:~ snow$

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I Corrupted my Boot Partition from deleting a new Mac partition on windows

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