So I installed boot camp and then couldn’t get windows to boot. So I ran a program called “gdisk” which I must have given the wrong instructions to.

Now I can’t access my Mac OS hard drive, but it looks like the data is still there in disk0. I have attached a picture of my “diskutil list” from recovery mode. Can anyone help me get it back to the right parameters?

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  • Add the output from fdisk /dev/disk0 – David Anderson Aug 12 '18 at 10:10

The partition information for macOS appears to be stored in the MBR partition table. You will need to manually copy the values from this table to a newly created GUID Partition Table (GPT).

  1. Boot to Internet Recovery mode.
  2. Open a Terminal application window.
  3. Use command below to printout the values in the MBR table.

    fdisk /dev/disk0
  4. Use the gpt command to create a GPT with the partition entries.

I would give more detailed instructions, but I would first need to see the output from fdisk.

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