After trying to install Windows via Bootcamp on (yes I understand what "beta" means) beta High Sierra 10.13 I was left with unbootable partition:

enter image description here

I cannot mount this disk. It's shown as "Mac OS Extended" file system though it was APFS. (The Untitled is the partition with newly installed Mac OS version via internet recover.

sudo gpt show 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  378644440      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC
  379054080     262144         
  379316224  109638488      3  GPT part - 7C3457EF-0000-11AA-AA11-00306543ECAC
  488954712    1280000      4  GPT part - 5361644D-6163-11AA-AA11-00306543ECAC
  490234712          7         
  490234719         32         Sec GPT table
  490234751          1         Sec GPT header

I have run two checks.

sudo fsck_apfs -fy -x /dev/rdisk0s2 


sudo fsck_hfs -fy -x /dev/rdisk0s2 


I understand that I deal with beta software, and I should not expect to recover lost partition, but nevertheless I would be grateful for suggestion, what to do to recover this partition.

  • Apple's solution will be "boot to recovery, wipe everything and set up" but could you elaborate on what "recover" and "unbeatable" means to you? (you might also add a gist showing sudo gpt show disk0 and diskutil list and optionally diskutil ap list in case our volunteer cadre of disk repair wizards show up (cough klanomath, cough). – bmike Aug 16 '17 at 8:15
  • @bmike Meant "unbootable". sudo gpt show disk0 : diskutil list: diskutil ap list: Thank you for your time. – Paul Brewczynski Aug 16 '17 at 8:25
  • OK - excellent edit. My knowledge isn't going to help other than to see if you can boot with option key or select the BootCamp volume from the Startup Disk pane - likely those aren't going to work given the data I see, but those steps can't hurt any more than what's done. Also - a bug report or feedback if you have that option with Apple might get an engineer's attention - they are clearly looking for real world breakage at this point in the beta process. – bmike Aug 16 '17 at 8:30

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