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I made this partition to move my data to Windows Disk Management

I deleted the partition because it was basically useless.. When I deleted the partition the recovery drive showed up... I think the boot disk was that partition.. Please help I do not wanna lose any data..

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    Golden Rule: Never touch the partitioning from within Windows. It has no clue how it's being fooled into thinking it's in charge. See the sidebar for some suggestions ➝
    – Tetsujin
    Jan 3, 2020 at 17:29
  • Ugh - if you can boot to Internet Recovery - you might be able to past in diskutuil list and get someone to help remap the partition. As long as no data was written, you might get everything back. Of course if you have a backup, you can just wipe and restore.
    – bmike
    Jan 3, 2020 at 19:01
  • @bmike If I understand the OP correctly the partition was deleted intentionally. It probably was an ExFAT partition to share data between macOS and Windows 8.1|10. The macOS system partition is the second partition. Additional two macOS/OS X recovery partitions (part3/part4). So probably nothing to recover but to repair the "boot logic" (probably the MBR).
    – klanomath
    Jan 3, 2020 at 19:14
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    @klanomath double ugh - thanks for the additional insight. As always, you and a few others are particularly skilled at the mechanics here. Sounds like we just need to focus on confirming data can be deleted and fixing the boot chain?
    – bmike
    Jan 3, 2020 at 19:35
  • Please add the output of sudo fdisk /dev/disk0 and the Win8.1 install method (BIOS|EFI). Your related question: Bootcamp installation of Windows 8.1 (High Sierra 10.13.6) audio driver doesn't work (iMac Mid 2011)
    – klanomath
    Jan 3, 2020 at 19:40

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Your best bet at this point is to perform some formal data recovery.

I've used Data Rescue 4 & 5 with good success. https://www.prosofteng.com/mac-data-recovery/

I've also used MiniTool's products, on the PC side to recover Mac data. https://www.minitool.com/data-recovery-software/free-for-mac.html

You can either boot your mac into Target Disk Mode if you can another Mac available. Or, you can create bootable recovery media from either vendor. The third option would be to have professional data recovery done, but that is expensive.

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The obvious lesson here is that a) always have a backup of your important data, especially if you are messing around with partitions. b) Don't make changes to partitions on the Windows side.

Cloud backups are so cheap these days there's really no sense in not having it, just in case.

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  • Great advice. There’s an outside chance the partition format could be rewritten with dd or another hex editor - advanced expert disk knowledge is required but that would get the files and the directory back assuming no writes happened, just that the partition table data structure was changed.
    – bmike
    Jan 3, 2020 at 19:02
  • "I made this partition to move my data to Windows" > "I deleted the partition because it was basically useless." Apparently no data recovery required. How does your contribution answer the OP's question (make macOS bootable again)?
    – klanomath
    Jan 3, 2020 at 19:28
  • @klanomath Reinstall the OS once the data is recovered. That should be quite easily inferred. Thank you for your valuable contribution to this conversation and OP's question. Jan 3, 2020 at 21:04

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