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Windows Partition Disappeared

I have a 2 fold problem - this started because I was getting a "No Operating System Found" error when booting my windows partition. I tried to follow some instructions in a thread I found here, and then wound up doing something which removed the windows partition from bootup altogether.


However, disk utility shows it still exists.


So, I need to (1) re-find the partition on bootup and (2) actually get it to boot.


I may have messed something up in terminal and if I can't get it to re-boot & need to reinstall that's fine, but then I also can't get bootcamp to work (crashes every time I hit "Continue", no drives plugged into USB), so that's a third problem I'm dealing with.


Any help would be appreciated, thanks.

iMac Line (2012 and Later)

Posted on Aug 20, 2019 7:52 PM

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31 replies

Aug 21, 2019 7:41 AM in response to nj35

nj35 wrote:

I did that opening the space from my main HD w/ disk utility and then using a partition software on Windows to bring it to the Windows side, was trying to add space to Windows partition w/o re-formatting

Apple does not allow changing partition sizes, once Windows is installed. If you use third-party tools, without proper backups, you can lose data.


Testdisk may be able to help you find the 'lost'' NTFS partition. Can you take a look at El Capitan has deleted my bootcamp window… - Apple Community and see if you can follow the steps to locate the NTFS header?

Aug 20, 2019 8:17 PM in response to Loner T

Hi Loner T, I can't find the exact link but it was one you posted using gdisk with a list of like 10 steps or so for how to use it - maybe I jumped the gun doing that.


I'm not sure I've ever been able to see Windows files in macOS Finder, where would I like for those?


2013 iMac, 10.13.6, Windows 10


Diskutil list below - you'll see a USB drive there now, backing up Mac OS before I do anything else stupid.


/dev/disk0 (internal, physical):


   #:                       TYPE NAME                    SIZE       IDENTIFIER


   0:      GUID_partition_scheme                        *1.0 TB     disk0


   1:                        EFI EFI                     209.7 MB   disk0s1


   2:                 Apple_APFS Container disk2         790.0 GB   disk0s2


   3:                 Apple_APFS Container disk1         36.3 GB    disk0s3


   4:       Microsoft Basic Data                         174.0 GB   disk0s4




/dev/disk1 (synthesized):


   #:                       TYPE NAME                    SIZE       IDENTIFIER


   0:      APFS Container Scheme -                      +36.3 GB    disk1


                                 Physical Store disk0s3


   1:                APFS Volume Untitled                1.9 MB     disk1s1




/dev/disk2 (synthesized):


   #:                       TYPE NAME                    SIZE       IDENTIFIER


   0:      APFS Container Scheme -                      +790.0 GB   disk2


                                 Physical Store disk0s2


   1:                APFS Volume Macintosh HD            734.0 GB   disk2s1


   2:                APFS Volume Preboot                 31.9 MB    disk2s2


   3:                APFS Volume Recovery                519.5 MB   disk2s3


   4:                APFS Volume VM                      20.5 KB    disk2s4




/dev/disk3 (external, physical):


   #:                       TYPE NAME                    SIZE       IDENTIFIER


   0:      GUID_partition_scheme                        *1.0 TB     disk3


   1:                        EFI EFI                     209.7 MB   disk3s1


   2:                  Apple_HFS My Passport             999.8 GB   disk3s2

Aug 22, 2019 3:05 PM in response to Loner T

APFS Containers (2 found)


|


+-- Container disk1 E5B6CD70-16FE-4408-A562-67FFA22C12AC


|   ====================================================


|   APFS Container Reference:     disk1


|   Size (Capacity Ceiling):      36346028032 B (36.3 GB)


|   Minimum Size:                 1761308672 B (1.8 GB)


|   Capacity In Use By Volumes:   85598208 B (85.6 MB) (0.2% used)


|   Capacity Not Allocated:       36260429824 B (36.3 GB) (99.8% free)


|   |


|   +-< Physical Store disk0s3 C3213A68-AC95-4D5E-8299-550E9A0FA3C9


|   |   -----------------------------------------------------------


|   |   APFS Physical Store Disk:   disk0s3


|   |   Size:                       36346028032 B (36.3 GB)


|   |


|   +-> Volume disk1s1 5FC86EFA-46DB-43E0-AA8F-7605844AD9A3


|       ---------------------------------------------------


|       APFS Volume Disk (Role):   disk1s1 (No specific role)


|       Name:                      Untitled (Case-insensitive)


|       Mount Point:               /Volumes/Untitled


|       Capacity Consumed:         1568768 B (1.6 MB)


|       FileVault:                 No


|


+-- Container disk2 BEF3BC1E-DB69-4ABD-A023-DFC47D586620


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


    APFS Container Reference:     disk2


    Size (Capacity Ceiling):      789999996928 B (790.0 GB)


    Minimum Size:                 789999996928 B (790.0 GB)


    Capacity In Use By Volumes:   736437678080 B (736.4 GB) (93.2% used)


    Capacity Not Allocated:       53562318848 B (53.6 GB) (6.8% free)


    |


    +-< Physical Store disk0s2 00D368BF-8673-4492-9C06-23F2303C7AB5


    |   -----------------------------------------------------------


    |   APFS Physical Store Disk:   disk0s2


    |   Size:                       789999996928 B (790.0 GB)


    |


    +-> Volume disk2s1 3F252232-71A7-36B0-A8A2-EA9B2A269213


    |   ---------------------------------------------------


    |   APFS Volume Disk (Role):   disk2s1 (No specific role)


    |   Name:                      Macintosh HD (Case-insensitive)


    |   Mount Point:               /


    |   Capacity Consumed:         733550428160 B (733.6 GB)


    |   FileVault:                 No


    |


    +-> Volume disk2s2 B84B0B42-0E67-48C9-AF7F-636F40212CE6


    |   ---------------------------------------------------


    |   APFS Volume Disk (Role):   disk2s2 (Preboot)


    |   Name:                      Preboot (Case-insensitive)


    |   Mount Point:               Not Mounted


    |   Capacity Consumed:         31924224 B (31.9 MB)


    |   FileVault:                 No


    |


    +-> Volume disk2s3 258A54B3-D72C-4D55-B591-D1A65804DFD6


    |   ---------------------------------------------------


    |   APFS Volume Disk (Role):   disk2s3 (Recovery)


    |   Name:                      Recovery (Case-insensitive)


    |   Mount Point:               Not Mounted


    |   Capacity Consumed:         519487488 B (519.5 MB)


    |   FileVault:                 No


    |


    +-> Volume disk2s4 4C3BAB34-74E7-48CD-BBE6-1D7F62229CCE


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


        APFS Volume Disk (Role):   disk2s4 (VM)


        Name:                      VM (Case-insensitive)


        Mount Point:               /private/var/vm


        Capacity Consumed:         2147540992 B (2.1 GB)


        FileVault:                 No

Windows Partition Disappeared

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