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Bootcamp partition lost after adding space to it twice

I have a MacBook Air from the middle of 2012, and I previously set up BootCamp to run OS X El Capitan v. 10.11.16 (170GB) and Windows 10 (80GB) a year ago. So everything was in order. My business apps require me to use Windows frequently, and I could do so until I ran out of capacity on my Windows hard disk. So I changed the size of my partition to 130GB for Mac with Disk Utility and 120GB for Windows using MiniTool Partition Wizard. It performed flawlessly at that time. I eventually run out of hard drive space once more. My project must be in the partition, even when utilizing external disks. Yesterday, I repeated the procedure. When I use the Alt Option button to restart my computer, the Windows Boot option is no longer available.

Best Answered by

iBoysoft author Amanda Wong

Amanda Wong

Answered on Wednesday, November 22, 2023

There are two ways to resize the Bootcamp partition: delete Windows from the Mac and recreate the Windows partition(lose all data on the Windows partition), or shrink the space of the Macintosh HD partition and merge the untitled space to Bootcamp with third-party software(no data lost).

You have already tried some Terminal commands to write in MBR, run First Aid on the Bootcamp partition, and use a third-party repair tool, but all of them fail to fix the Bootcamp partition loss issue. According to the screenshot, the Apple Boot partition (620MB) is missing, you have deleted your local recovery partition, so you will need to fix it with these steps:

  1. Create a bootable install for macOS and boot your Mac from it.
  2. Then, enter macOS Recovery Mode to disable SIP
  3. Upgrade macOS to match the version on your internal disk.
  4. Delete extra partitions on the 2012 MacBook Air.

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