Short Version of this Guide >> http://fgimian.github.io/blog/2016/03/12/installing-windows-10-on-a-mac-without-bootcamp/
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)
Step 1 A & B are done in Recovery Mode
A: Partitioning HD in Recovery
B: Disable "rootless environment" >> https://superuser.com/questions/508026/windows-detects-gpt-disk-as-mbr-in-efi-boot (See El Capitan Addendum:)
Step 2: Confirm Protected MBR >> https://superuser.com/questions/508026/windows-detects-gpt-disk-as-mbr-in-efi-boot
Check disk status via
sudo gdisk /dev/disk0
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
Step 4: Bootcamp/Mac Hardware Tweaks
First extract the zip into your downloads folder, then run the following
msiexec /i %USERPROFILE%\Downloads\bootcamp*\BootCamp\Drivers\Apple\bootcamp.msi
Manually Install Realtek Drivers via...
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 partitions.