Your actual input may vary from what is shown.
This input is correct for the drive used as an example in this answer. sudo gdisk /dev/disk0Įnter the input given below. (See the above question for the output from this command.) gpt -r show /dev/disk0Įnter the command given below. You will need this information verify the changes made to the MBR table. The command given below can be used to partially display the information contained in GPT stored on disk0. You also can execute gpt, gdisk and fdisk from macOS Recovery, but this may require you to precede the gdisk command with a path. This will allow you to use the commands gpt, gdisk and fdisk. Note: The Terminal application can be found under "Utilities" on the menu bar.ĭisable SIP and then boot back to macOS.
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Note: If you get a popup similar to the one shown below, then will need to run the Terminal application command shown below before trying to install gdisk.
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While booted to macOS, download and install gdisk. Here are the methods involving in editing the MBR table to create a hybrid partitioning scheme. Microsoft Windows Recovery Environment 27 DE94BBA4-06D1-4D40-A16A-BFD50179D6AC Below is a table of some commonly found types.
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To update the MBR partition table, a mapping of the partition types needs to be known. Here, I assume you are using High Sierra (macOS 10.13.2). Note: The next two commands were executed after starting up from macOS Recovery.īelow is the output from the command gpt -r show /dev/disk0. The BOOTCAMP volume is NTFS formatted and the COMMON volume is FAT32 formatted. dev/disk0 (internal, physical):Ģ: Apple_APFS Container disk1 249.5 GB disk0s2ģ: Microsoft Basic Data BOOTCAMP 200.0 GB disk0s3Ĥ: Microsoft Basic Data COMMON 50.0 GB disk0s4
What is a procedure to manually convert the drive back to the hybrid format?īelow is the output from the command diskutil list disk0. My Mac needs the hybrid format in order to BIOS boot the installed Windows operating system. I am not sure when this changed, but this no longer happens under High Sierra (macOS 10.13.2). Previous versons of OS X and macOS automatically converted pure GPT drives to hybrid GPT/MBR format when the 2nd, 3rd, and/or 4th GPT partitions were formatted "MS DOS (FAT)" by the Disk Utility application or the diskutil command.
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