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Short Version of this Guide >> http://fgimian.github.io/blog/2016/03/12/installing-windows-10-on-a-mac-without-bootcamp/

Needed:

MacOS Already Installed and working

USB w/ Windows 10 formatted for EFI

BootCamp Drivers >> https://support.apple.com/downloads/boot-camp

GPTFDisk Binary Package for MacOS >> https://sourceforge.net/projects/gptfdisk/files/gptfdisk/1.0.3/gdisk-binaries/ (Get the one ending in .pkg)

Setup:

  • Create bootable Windows USB (Note: Linked Guide uses UNetBootin which is for Linux/Mac, if using Rufus, make sure to format as "GPT Partition Scheme for UEFI")
  • On 2nd USB (Or do this first) then copy over the following to the USB stick (Needs to be formatted as FAT for MacOS to read)
  • gdisk-*.pkg

Step 1 A & B are done in Recovery Mode

A: Partitioning HD in Recovery  

  • Access Recovery via pressing Option + R when powering on Mac
  • Open Disk Utility
  • View All Devices
  • Create New Partition by hitting + symbol in blue 
  • You must change the partition size before selecting to FORMAT as MS-DOS(FAT)
  • We will add a 3rd Partition later

B: Disable "rootless environment" >> https://superuser.com/questions/508026/windows-detects-gpt-disk-as-mbr-in-efi-boot (See El Capitan Addendum:)

  • Utilities > Terminal 
csrutil disable
  • Note: After you will do the same except pass "csrutil enable" and reboot

Step 2: Confirm Protected MBR >> https://superuser.com/questions/508026/windows-detects-gpt-disk-as-mbr-in-efi-boot

  • Reboot and Install GPTFDisk Package

Check disk status via

sudo gdisk /dev/disk0
  • Mine was already/stayed "Protected" after creating FAT Partition for Windows so... I tried installing Windows, but it gave a different Error “Windows cannot be installed on this disk. The selected disk is of the GPT partition style.” But, this was likely due to creating a bad USB w/ RUFUS Set to format as MBR vs GPT. I'd love if somebody tried without gdisk and commented, but once I got it (Windows) to install, I wasn't about to bork it just to test.
  • SO NOT MATTER WHAT IT SAYS THE FIRST TIME, FOLLOW THE GUIDE(S)!
  • At the Prompt you now need to press the following:

    x	# Go to Experts Menu
    n	# Create Fresh Protective MBR, doesn't give you any confirmation it worked
    w	# Save Changes
    y	# Yes you are sure you trust random guides on the internet
  • This is example output of "Protective" MBR, which is what it showed me the first time, but I ended up doing the above steps twice before realize it was a bad USB. (Needs to show "EFI Boot" as an option in Mac Bootloader)

     

    GPT fdisk (gdisk) version 1.0.3
    
    Warning: Devices opened with shared lock will not have their
    partition table automatically reloaded!
    Partition table scan:
      MBR: protective
      BSD: not present
      APM: not present
      GPT: present
    
    Found valid GPT with protective MBR; using GPT.

Step 3: Install Windows

  • Reboot and unplug everything but USB
  • Load USB
  • NOTE IF YOU DON'T SEE "EFI Boot" your USB isn't formatted correctly!
  • When selecting drive, delete previously created partition and create new NTFS Partition
  • This is a good time to create the 3rd "Shared" Partition

Step 4: Bootcamp/Mac Hardware Tweaks

  • Install bootcamp by running setup.exe inside bootcamp*.zip
  • If you encounter Realtek Audio issues: 
    • Use Task Manager to kill Process "RealTekSetup.exe"
    • DON'T REBOOT
    • Manually Install Realtek Drivers via...

      %USERPROFILE%\AppData\Local\Temp\RarSFX0\BootCamp\Drivers\RealTek\RealtekSetup.exe
  • Reboot Windows
  • There are additional software reccomendations in the article at the top such as "SharpKeys" and "FlipWheel", but I didn't use them.

TEST REBOOTING INTO EACH OS

Afterwards you are going to want to setup read/write access to each partition

Share Mac + Windows NTFS/HFS Read/Write Access across both OS:

- Windows is installed on NTFS Drive
- MacOS is installed on HFS+ Formatted Drive

Both will have read access off the hop, but to get write access you will need 3rd party drivers for each OS.

Windows needs HFS+ Drivers to write to Mac OS Partition

MacOS needs NTFS Drivers to write to Windows OS Partition

- Rec is Paragon HFS+ for Windows & Paragon NTFS for Mac
- Free Trial available but costs $

Boot into each OS and confirm you can read/write a simple file to all 3 partitions.

  • Rec making 3rd Partition NTFS for best Windows support. Ext3 for best Linux support.
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