MacOS – Can’t boot into Mac OS after Windows install via Bootcamp

bootcampmacospartition

I just installed Windows 10 successfully via BootCamp. Now I am neither able to boot into OSX, nor is its partition shown anywhere.

Turns out the issue occurs because of a mistake I made during the Windows installation. Once Bootcamp created the BOOTCAMP partition and restarted the system, I noticed that there was an additional small-sized partition created (~600 MB) just before the BOOTCAMP partition. Instead of ignoring it, I deleted and recreated the bootcamp partition from Windows Setup. Now I am only able to boot into Windows 10.

Now my question is: How can I recreate the deleted partition in order to be able to reboot into OS X?

I booted into Recovery Mode using cmd + r and ran diskutil list. Here is the outcome:

Besides, the Macintosh HD partition is also shown in Disk Utility:

The Recovery Mode even gives me the option to boot into my Mac partition, but doing so results in a black screen.

I am grateful for any suggestions out of this misery.

Edit 1

Output of gpt -r show /dev/disk0

bash-3.2# gpt -r show /dev/disk0
    start      size index contents
        0         1       PMBR
        1         1       Pri GPT header
        2        32       Pri GPT table
       34         6
       40    409600     1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
   409640 408928144     2 GPT part - 53746F72-6167-11AA-AA11-00306543ECAC
409337784        72
409337856     32768     3 GPT part - E3C9E316-0B5C-4DB8-817D-F92DF00215AE
409370624  80863232     4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
490233856       863
490234719        32       Sec GPT table
490234751         1       Sec GPT header

Output of `diskutil cs list

-bash-3.2# diskutil cs list
CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group 017D5AE8-30F7-45E1-879E-BB02C0EC3DC1
    =========================================================
    Name:         Macintosh HD
    Status:       Online
    Size:         209371209728 B (209.4 GB)
    Free Space:   35655680 B (35.7 MB)
    |
    +-< Physical Volume FB261C56-1F49-4690-9B15-8C4EAA4770B0
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk0s2
    |   Status:   Online
    |   Size:     209371209728 B (209.4 GB)
    |
    +-> Logical Volume Family A62719EC-A4E5-4821-B7E0-831444CC3...
        ----------------------------------------------------------
        Encryption Status:       Unlocked
        Encryption Type:         None
        Conversion Status:       NoConversion
        Conversion Direction:    -none-
        Has Encrypted Extents:   No
        Fully Secure:            No
        Passphrase Required:     No
        |
        +-> Logical Volume D0DEC2A0-0E60-49B1-9758-40E7677A5346
             Disk:                  disk2
             Status:                Online
             Size (Total):          209000005632 B (209.0 GB)
             Conversion Progress:    -none-
             Revertible:            Yes (no decryption required)
             LV Name:               Macintosh HD
             Volume Name:           Macintosh HD
             Content Hint:          Apple_HFS`

Best Answer

The small partition you've deleted is your on-board Recovery HD. But deleting it isn't the real reason why you can't boot. You hosed your GUID partition table by manipulating it from inside Windows 10.

The basic steps you have to execute are:

Preparation:

Detach any external drive (especially an external Time Machine backup drive).
Restart to Internet Recovery Mode by pressing alt cmd R at startup.
The prerequisites are the latest firmware update installed, either ethernet or WLAN (WPA/WPA2) and a router with DHCP activated.
On a 50 Mbps-line it takes about 4 min (presenting a small animated globe) to boot to a recovery netboot image which usually is loaded from an apple/akamai server.

I recommend ethernet because it's more reliable. If you are restricted to WIFI and the boot process fails, just restart your Mac until you succeed booting.

Alternatively you may start from a bootable installer thumb drive (Mavericks or Yosemite) or a thumb drive containing a full system (Mavericks or Yosemite).

Modify GUID partition table:

Open in the menubar Utilities/Terminal

First you should get an overview of your disks and the partition layout:

Enter diskutil list, diskutil cs list and gpt -r show /dev/disk0

diskutil list:

bash-3.2# diskutil list
/dev/disk0
   #:                       TYPE NAME               SIZE      IDENTIFIER
   0:      GUID_partItion_scheme                   *251.0 GB  disk0
   1:                        EFI EFI                209.7 MB  disk0s1
   2:          Apple_CoreStorage                    209.4 GB  disk0s2
   3:         Microsoft Reserved                     16.8 MB  disk0s3
   4:       Microsoft Basic Data BOOTCAMP            41.4 08  disk0s4
/dev/disk1
   #:                       TYPE NAME               SIZE      IDENTIFIER
   0:     Apple_partition_scheme                     *1.3 GB  disk1
   1:        Apple_partition_map EFI                 30.7 KB  disk1s1
   2:                  Apple_HFS OS X Base System     1.3 GB  disk1s2
/dev/disk2
   #:                       TYPE NAME               SIZE      IDENTIFIER
   0:                  Apple_HFS Macintosh HD      *209.0 GB  disk2

/dev/disk3 - /dev/disk13 part of the Recovery System

diskutil cs list:

-bash-3.2# diskutil cs list
CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group 017D5AE8-30F7-45E1-879E-BB02C0EC3DC1
    =========================================================
    Name:         Macintosh HD
    Status:       Online
    Size:         209371209728 B (209.4 GB)
    Free Space:   35655680 B (35.7 MB)
    |
    +-< Physical Volume FB261C56-1F49-4690-9B15-8C4EAA4770B0
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk0s2
    |   Status:   Online
    |   Size:     209371209728 B (209.4 GB)
    |
    +-> Logical Volume Family A62719EC-A4E5-4821-B7E0-831444CC3...
        ----------------------------------------------------------
        Encryption Status:       Unlocked
        Encryption Type:         None
        Conversion Status:       NoConversion
        Conversion Direction:    -none-
        Has Encrypted Extents:   No
        Fully Secure:            No
        Passphrase Required:     No
        |
        +-> Logical Volume D0DEC2A0-0E60-49B1-9758-40E7677A5346
             Disk:                  disk2
             Status:                Online
             Size (Total):          209000005632 B (209.0 GB)
             Conversion Progress:    -none-
             Revertible:            Yes (no decryption required)
             LV Name:               Macintosh HD
             Volume Name:           Macintosh HD
             Content Hint:          Apple_HFS

gpt -r show /dev/disk0:

bash-3.2# gpt -r show /dev/disk0
    start      size index contents
        0         1       PMBR
        1         1       Pri GPT header
        2        32       Pri GPT table
       34         6
       40    409600     1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
   409640 408928144     2 GPT part - 53746F72-6167-11AA-AA11-00306543ECAC
409337784        72
409337856     32768     3 GPT part - E3C9E316-0B5C-4DB8-817D-F92DF00215AE
409370624  80863232     4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
490233856       863
490234719        32       Sec GPT table
490234751         1       Sec GPT header

Unmount the CoreStorage volume first and then the main disk:

diskutil umountDisk /dev/disk2
diskutil umountDisk /dev/disk0

then delete the Windows partitions on your main disk with gpt:
```
gpt remove -i 4 /dev/disk0
gpt remove -i 3 /dev/disk0
```
If you get an error "gpt remove: unable to open device '/dev/disk0': Resource busy" trying to remove a second (or third) partiton just repeat
```
diskutil umountDisk /dev/disk2
diskutil umountDisk /dev/disk0
```
After deleting or adding a partition with gpt the system sometimes|often|always tries to immediately mount all remaining partitions. If you get an error similar to "disk2 is not mounted" trying to unmount disk2, just continue with diskutil umountDisk /dev/disk0.
delete the GUID partition table and force create a new one:
```
gpt destroy /dev/disk0
gpt create -f /dev/disk0
```

add the EFI-partition and the Macintosh HD Logical Volume Group with gpt

gpt add -b 40 -i 1 -s 409600 -t C12A7328-F81F-11D2-BA4B-00A0C93EC93B disk0 
gpt add -b 409640 -i 2 -s 408928144 -t 53746F72-6167-11AA-AA11-00306543ECAC disk0

disk0 and the CoreStorage should be mounted automatically after adding the second volume. Please check this with diskutil list and df. Your CoreStorage volume may have different DiskIdentifier now. After entering diskutil list to get the DiskIdentifier of your CoreStorage volume enter df and check if the file system is mounted. The output is similar to that one:
```
User$ df
Filesystem     512-blocks       Used  Available Capacity   iused     ifree %iused  Mounted on
...
/dev/disk13     6066780416 5444610552  621657864    90% 680640317  77707233   90%  /Volumes/Macintosh HD
...
```
If the CoreStorage wasn't mounted earlier, you may mount it with diskutil mount /dev/disk13 (or whatever the DiskIdentifier of your CoreStorage Volume is).
open Disk Utility and verify/repair first the hard drive, then the CoreStorage volume. If the CoreStorage wasn't mounted earlier

Expand the CoreStorage volume:

expand the Macintosh HD Logical Volume Group to the full available size of your main disk:
```
diskutil cs resizeStack LVUUID size #LVUUID = Logical Volume UUID
```
In your case (just copy the UUID of the Logical Volume in the "diskutil cs listing" you got earlier and paste it here. The UUID below might be faulty because I OCRed your screenshot):
```
diskutil cs resizeStack D0DEC2A0-0E60-49B1-9758-40E7677A5346 0g
```
If you encounter an error like "Error: -69722: You can't perform this resize unless it has a booter (target partition is probably too small)" here, you have to revert your CoreStorage volume to a normal volume:
```
diskutil cs revert LVUUID
```
In your case:
```
diskutil cs revert D0DEC2A0-0E60-49B1-9758-40E7677A5346
```
Then quit Terminal by entering exit and open Disk Utility. Mount the volume Macintosh HD if unmounted and verify/repair it. Choose the hard disk and then the partition tab. Expand the volume with the slider to the full size of your hard disk.

Recreate Recovery HD

now try to boot to Macintosh HD
by reinstalling Lion with the latest Lion installer (10.7.5) your Recovery HD will be recreated. Your data and already installed applications shouldn't be affected by reinstalling Lion. If you had no CoreStorage volume, you may use Recovery Partition Creator 3.8 instead.

Reinstall Windows 10

Install Windows 10 with the Boot Camp Assistant

If you run into problems please add a comment with @klanomath

Related Solutions

MacOS – Unable to reformat/repartition CoreStorage logical volume (Fusion drive)

I was able to delete a mess I made trying to delete my Raid 10 in diskutil (which ended up looking similar to above) using the commands below in Terminal.app. May or may not work with fusion but it's easier than booting up again.

Get rid of the volume - copy paste the logical volume name where it says "Logical Volume Name", without the quotes:

diskutil cs deleteVolume "*Logical Volume Name*"

Free the disk - copy paste the volume name where it says "Physical Volume Name", without the quotes:

diskutil cs removeDisk "*Physical Volume name*"

Repeat these steps as needed.

I think I messed up the Fusion Drive on the 1TB iMac (with BootCamp)

Theoretically everything is fine with your Fusion Drive. Fusion Drives look like this. Disk0 is your SSD with 121 GB and disk1 is your HDD with ~1 TB (~1.121 TB summed up).

The larger parts of your SSD (disk0s2) and your HDD (disk1s2) are pooled to a CoreStorage LVG (Fusion Drive: disk3) with a size of 967.8 GB. The rest is reserved for EFIs, a Recovery HD (alltogether ~1.3 GB) and your old Windows partition - now probably free space (~152 GB).

The logical volume 'Macintosh HD' (967.8 GB) spans disk0s2 and disk1s2. This is the first 'Macintosh HD' in picture 1. The volume 'Macintosh HD' - it's the one visible on the desktop - should ideally also have about 967.8 GB. This is the second 'Macintosh HD' in picture 1.
In fact it has only 852.67 GB (see picture 3).

In the second picture the logical volume 'Macintosh HD' is the first listed in black, the volume 'Macintosh HD' is the second listed in black, the other two 'Macintosh HD's listed in grey are the parts of your SSD and HDD dedicated to the logical volume 'Macintosh HD'.

In my opinion something went wrong after deleting various partitions with the Bootcamp Assistant/Disk Utility or in Windows.

Preparation:

Detach any external drive (especially your external Time Machine backup drive)
Restart to Internet Recovery Mode by pressing alt cmd R at startup.
The prerequisites are the latest firmware update installed, either ethernet or WLAN (WPA/WPA2) and a router with DHCP activated.
On a 50 Mbps-line it takes about 4 min (presenting a small animated globe) to boot into a recovery netboot image which usually is loaded from an apple/akamai server.

I recommend ethernet because it's more reliable. If you are restricted to WIFI and the boot process fails, just restart your Mac until you succeed booting.

Alternatively you may start from a bootable installer thumb drive (preferably Mavericks or Yosemite) or a thumb drive containing a full system (preferably Mavericks or Yosemite).

Now you may either repair CoreStorage or rebuild your Fusion Drive:

'Repair CoreStorage' (not recommended):

First i would try to check the volume 'Macintosh HD' with Disk Utility. If the volume is corrupted consider a reinstall of Mac OS X.
If the volume is ok quit Disk Utility
Open Terminal and enter diskutil unmountDisk /dev/LVIdentifier and both diskutil unmountDisk /dev/DiskContainingApple_CoreStorageIdentifier
In your case: first diskutil unmountDisk /dev/disk3 then diskutil unmountDisk /dev/disk0 and diskutil unmountDisk /dev/disk1
remove the EFI NO NAME partition with gpt remove -i IndexNumberOfEFINoName DiskIdentifier:
gpt remove -i 4 disk1
Remount the CoreStorage disks and then the Logical Volume:
In your case: first diskutil mountDisk /dev/disk0 and diskutil mountDisk /dev/disk1 and then diskutil mount /dev/disk3.

enter gpt -r -vvv show /dev/diskIdentfierOfApple_CoreStorage to get infos of your HDD CoreStorage disk.
In your case: gpt -r -vvv show /dev/disk1
It should look like this:

-bash-3.2# gpt -r -vvv show /dev/disk1
gpt show: /dev/disk1: mediasize=1000204886016; sectorsize=512;         blocks=1953525168
gpt show: /dev/disk1: PMBR at sector 0
gpt show: /dev/disk1: Pri GPT at sector 1
gpt show: /dev/disk1: GPT partition: type=C12A7328-F81F-11D2-BA4B-00A0C93EC93B, start=40, size=409600
gpt show: /dev/disk1: GPT partition: type=53746F72-6167-11AA-AA11-00306543ECAC, start=409640, size=1671210848
gpt show: /dev/disk1: GPT partition: type=426F6F74-0000-11AA-AA11-00306543ECAC, start=1671620488, size=1269760
gpt show: /dev/disk1: Sec GPT at sector 1953525167                               
     start          size  index contents                                        
         0             1        PMBR                                            
         1             1        Pri GPT header                                  
         2            32        Pri GPT table                                   
        34             6
        40        409600      1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
    409640    1671210848      2 GPT part - 53746F72-6167-11AA-AA11-00306543ECAC
1671620488       1269760      3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
1672890248     280634887
1953525135            32        Sec GPT table
1953525167             1        Sec GPT header

The free space on your HDD has 280634887 blocks. Please calculate the biggest block number dividable through 8. That's 280634880 blocks (á 512 bytes) which equals 143685058560 B or ~143.7 GB. Add the size of your HDD CoreStorage Physical Volume (852666400768 B) The result is 143685058560 B + 852666400768 B = 996351459328 B
Resize your HDD CoreStorage physical volume with diskutil cs resizeDisk HDDPVUUID newsize
In your case: diskutil cs resizeDisk 93892BE8-2B7F-4ABD-A4C3-984495DCD98D 996351459328b
Calculate the maximal size of your CoreStorage Logical Volume in diskutil cs list: (size disk0s2) + (size disk1s2) In your case that's 120988852224 B + 996351459328 B = 1117340311552 B. That should be the size of your refreshed Logical Volume Group.
Resize your Logical Volume with diskutil cs resizeVolume LVUUID LVGSize-128 MB In your case that's diskutil cs resizeVolume D237FFDC-7DA4-41D7-AC13-4CC7E5E8C0A0 1117212311552b. If you get an error (There is not enough free space...) choose a smaller size like 1117148311552b.
Quit Terminal and open Disk Utility.
Check your expanded CoreStorage Volume for errors.
Quit Disk Utility, choose your CS volume as startup disk and restart your Mac

'Rebuild Fusion Drive' (recommended if you have a Time Machine backup)

Booted to Internet Recovery Mode open Utilities → Terminal in the menubar and enter:
diskutil cs list to get the CoreStorage listing.
Copy the Logical Volume UUID, it's the fifth listed.
Now delete the Logical Volume with diskutil cs deleteVolume LVUUID.
In your case: diskutil cs deleteVolume D237FFDC-7DA4-41D7-AC13-4CC7E5E8C0A0.
Copy the Logical Volume Group UUID, it's the first listed in the listing of diskutil cs list.
Then delete the Logical Volume Group with diskutil cs delete LVGUUID.
In your case: diskutil cs delete 1EFE58BC-3613-44C4-86EE-D816F3B66E3E
Enter exit and quit 'Terminal'
Open 'Disk Utility'. Enter 'Ignore' if you are asked to fix the drives.
Choose your SSD and partition it: 1 Partition Mac OS X Extended (Journaled), hit the Options button and choose GUID Partiton table and hit OK and Apply.
Please check that the size is ~121 GB

Example:
Choose your HDD and partition it: 1 Partition Mac OS X Extended (Journaled), hit the Options button and choose GUID Partiton table and hit OK and Apply.
Please check that the size is ~1 TB

Example:
Quit Disk Utility and open Terminal
Enter diskutil list

Example (your disk identifiers and sizes are different of course: Your volume SSD probably has the Identifier disk0s2 and the size 121 GB and your volume HDD probably has the Identifier disk1s2 and the size 1.0 TB):
Enter diskutil cs create "Name" IdentifierSSD IdentifierHDD
In your case probably diskutil cs create "Macintosh HD" disk0s2 disk1s2.

Copy the resulting LVGUUID

Example:
Enter diskutil cs CreateVolume LVGUUID jhfs+ "Macintosh HD" 100%.

Example:
Enter diskutil cs list
Check the size of your Logical Volume. It should have the size ~1.121 TB

Example:
Quit Terminal
Open 'Disk Utility' and check your newly created volume for errors
Quit 'Disk Utility'
Attach your external Time Machine backup drive or check this answer if you use NAS or another network share.
Open 'Restore from Time Machine Backup'
Choose the appropriate Time Machine backup and restore your system
Reboot to your restored system.
Unmount and detach your Time Machine backup drive
Open 'Terminal' and enter 'diskutil list'
Check if your 'Recovery HD' is listed.
If your 'Recovery HD' is missing, usually reinstalling your current system with the latest available system installer (e.g. 'Install OS X Mavericks (10.9.5)' if Mavericks is currently installed) will recreate it without loosing any data. AFAIK Recovery Partition Creator 3.8 will NOT create a Recovery HD on CoreStorage volumes.
After reinstalling the system with the latest available system installer open App Store and install the latest security fixes.

Best Answer

Related Solutions

MacOS – Unable to reformat/repartition CoreStorage logical volume (Fusion drive)

I think I messed up the Fusion Drive on the 1TB iMac (with BootCamp)

Related Question