Macintosh HD missing after Boot Camp

Question

Level 1

8 points

Macintosh HD missing after Boot Camp

Hello,

This weekend I used Boot Camp to install Windows 10 on a 66GB partition of my hard drive. During the partitioning process, I received an error message that partitioning could not be completed due to an error. I decided to put off troubleshooting until later and just closed Boot Camp, but next time I restarted my machine it booted automatically into Windows 10, completed setup, and Boot Camp is accessible from within Windows.

Now my problem is that the only portion of my hard drive that seems to be accessible is the Boot Camp partition. It's correctly reading the size of 66GB but when I attempt to restart and hold option I don't get the "Macintosh HD" as a startup disk. After booting into internet recovery, I can see the Boot Camp partition and what seems to be the Recovery partition despite that not appearing as an option in startup.

I'm on a late-2013 iMac running OS X El Capitan. I have no idea what my next step should be now, any advice would be greatly appreciated.

Posted on Sep 30, 2017 8:58 PM

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Answer 1

hawkwolfe Author

Level 1

8 points

Oct 1, 2017 8:22 AM in response to Loner T

Yes, I've done this to access Disk Utility. It lists "Virtual Whole Disk" in red with only the 66GB Boot Camp partition under it. It also shows what appears to be the recovery drive, but I haven't found it as a boot option anywhere. Also, the Startup Disk menu only lists Windows as an option.

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Answer 2

Loner T

Level 9

59,471 points

Oct 1, 2017 11:14 AM in response to hawkwolfe

Click on Utilities -> Terminal in Recovery Console, and run

diskutil list

diskutil apfs list

diskutil cs list

Copy (Command+C) the output, quit Terminal, start Safari (Get Online Help), Paste (Command+V) the output as a reply to this discussion.

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Answer 3

hawkwolfe Author

Level 1

8 points

Oct 1, 2017 1:53 PM in response to Loner T

-bash-3.2# diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *1.0 TB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_CoreStorage 933.3 GB disk0s2

3: Apple_Boot 650.0 MB disk0s3

4: Microsoft Basic Data BOOTCAMP 66.0 GB disk0s4

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: Apple_partition_scheme *1.3 GB disk1

1: Apple_partition_map 30.7 KB disk1s1

2: Apple_HFS OS X Base System 1.3 GB disk1s2

/dev/disk2

#: TYPE NAME SIZE IDENTIFIER

0: untitled *5.2 MB disk2

/dev/disk3

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk3

/dev/disk4

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk4

/dev/disk5

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk5

/dev/disk6

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk6

/dev/disk7

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk7

/dev/disk8

#: TYPE NAME SIZE IDENTIFIER

0: untitled *6.3 MB disk8

/dev/disk9

#: TYPE NAME SIZE IDENTIFIER

0: untitled *2.1 MB disk9

/dev/disk10

#: TYPE NAME SIZE IDENTIFIER

0: untitled *1.0 MB disk10

/dev/disk11

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk11

/dev/disk12

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk12

/dev/disk13

#: TYPE NAME SIZE IDENTIFIER

0: untitled *1.0 MB disk13

/dev/disk14

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *4.0 TB disk14

1: Apple_HFS My Book 4.0 TB disk14s1

/dev/disk15

#: TYPE NAME SIZE IDENTIFIER

0: untitled *6.3 MB disk15

-bash-3.2# diskutil apfs list

diskutil: did not recognize verb "apfs"; type "diskutil" for a list

-bash-3.2# diskutil cs list

CoreStorage logical volume groups (1 found)

|

+-- Logical Volume Group 0FD8813E-F606-4A35-88A5-E376055A98FF

=========================================================

Name: -none-

Status: Initializing

Size: 0 B (0 B)

Free Space: -none-

|

+-< Physical Volume 5E36DCA7-016E-46C0-AC85-BA1C7902B43C

----------------------------------------------------

Index: 18446744073709551615

Disk: disk0s2

Status: Failed

Size: -none-

-bash-3.2#

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Answer 4

hawkwolfe Author

Level 1

8 points

Oct 1, 2017 3:25 PM in response to Loner T

-bash-3.2# diskutil repairDisk disk0

Repairing the partition map might erase disk0s1, proceed? (y/N) y

Started partition map repair on disk0

Checking prerequisites

Checking the partition list

Adjusting partition map to fit whole disk as required

Checking for an EFI system partition

Checking the EFI system partition's size

Checking the EFI system partition's file system

Checking the EFI system partition's folder content

Checking all HFS data partition loader spaces

Checking booter partitions

Checking booter partition disk0s3

Updating boot support partitions for the volume as required

Reviewing boot support loaders

Checking Core Storage Physical Volume partitions

Verifying storage system

Checking volume

disk0s2: Scan for Volume Headers

Invalid Volume Header @ 933335531008: invalid field value

Invalid Volume Header @ 999345126912: I/O error, invalid field value

disk0s2: Scan for Disk Labels

Invalid Disk Label @ 999328346112: I/O error, invalid field value

Invalid Disk Label @ 999332540416: I/O error, invalid field value

Invalid Disk Label @ 999336734720: I/O error, invalid field value

Invalid Disk Label @ 999340929024: I/O error, invalid field value

disk0s2 is not a CoreStorage volume

Storage system check exit code is 1

Repairing storage system

Checking volume

disk0s2: Scan for Volume Headers

Invalid Volume Header @ 933335531008: invalid field value

Invalid Volume Header @ 999345126912: I/O error, invalid field value

disk0s2: Scan for Disk Labels

Invalid Disk Label @ 999328346112: I/O error, invalid field value

Invalid Disk Label @ 999332540416: I/O error, invalid field value

Invalid Disk Label @ 999336734720: I/O error, invalid field value

Invalid Disk Label @ 999340929024: I/O error, invalid field value

disk0s2 is not a CoreStorage volume

Storage system check exit code is 1

Repairing storage system

Checking volume

disk0s2: Scan for Volume Headers

Invalid Volume Header @ 933335531008: invalid field value

Invalid Volume Header @ 999345126912: I/O error, invalid field value

disk0s2: Scan for Disk Labels

Invalid Disk Label @ 999328346112: I/O error, invalid field value

Invalid Disk Label @ 999332540416: I/O error, invalid field value

Invalid Disk Label @ 999336734720: I/O error, invalid field value

Invalid Disk Label @ 999340929024: I/O error, invalid field value

disk0s2 is not a CoreStorage volume

Storage system check exit code is 1

Problems were encountered during repair of the partition map

Error: -69716: Storage system verify or repair failed

Underlying error: 1: POSIX reports: Operation not permitted

-bash-3.2#

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Answer 5

hawkwolfe Author

Level 1

8 points

Oct 6, 2017 2:45 PM in response to Loner T

Thanks for the help thus far, I got busy with the work week but am finishing this up now.

I was able to recover all of the data from the hard drive to an external drive, so now all I need to do is reformat the internal drive so I can reinstall macOS. Since Disk Utility doesn't recognize the drive at all outside of the Boot Camp partition, is there a way to use Terminal to format the drive? Thanks again!

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Answer 6

Loner T

Level 9

59,471 points

Oct 6, 2017 3:37 PM in response to hawkwolfe

hawkwolfe wrote:

Since Disk Utility doesn't recognize the drive at all outside of the Boot Camp partition, is there a way to use Terminal to format the drive?

Yes, run

diskutil eraseDisk disk0

and post the output.

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Answer 7

Loner T

Level 9

59,471 points

Oct 1, 2017 8:13 AM in response to hawkwolfe

Can you boot into Internet Recovery - About macOS Recovery - Apple Support ?

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Answer 8

Loner T

Level 9

59,471 points

Oct 1, 2017 3:36 PM in response to hawkwolfe

This does not look good. The I/O errors are a pain. Do you have a Time Machine backup of macOS?

Are you aware of Apple - Support - iMac 1TB Seagate Hard Drive Replacement Program ?

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Answer 9

Loner T

Level 9

59,471 points

Oct 1, 2017 6:36 AM in response to hawkwolfe

If you restart your Mac and hold Alt/Option key when it is rebooting, what available selections do you see? If you see macOS, select it and try to boot macOS.

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