[Guide] Multi Boot Windows and macOS (UEFI) on Separate Drives

EliteMacx86

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Staff member
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Motherboard
GIGABYTE Z370 AROUS GAMING 3
CPU
Intel Core i9 9900K
Graphics
2xAMD RX 580 8GB
OS X/macOS
10.15.x
Bootloader
Clover (UEFI)
Mac
MacBook Pro
Mobile Phone
Android, iOS
Installing Windows 10


Step 7: Preparation for installing Windows 10

So after installing macOS High Sierra and completing post installation, the next step is install Windows 10. Before you install Windows 10, you’ll need to shut Down your PC and remove the macOS installation Drive. This is done in order to avoid any issues when installing Windows. Make sure that that you don't disconnect Windows drive.

Step 8: Installing Windows 10

Plug your Windows 10 USB Flash Drive and start your PC, .

Press F12 to enter your Boot Menu.

Select your USB Flash Drive with the UEFI Prefix.

In few minutes, it will boot to the installer screen.

Wait for it to load, and after that you will see Windows 10 welcome installer screen.

Select your Time and Currency Format and click on Next.

Click on Install now.

Now the Setup will start.


Now if you’re having any existing product key for your Windows 10, then you can type it here and you can activate it later on from your Windows 10 Desktop. This is the trial copy downloaded from Microsoft. So if you’re having a genuine copy, you can use that ISO or that DVD and if you’re having any existing Windows 10 product key or if you want to buy the product key for Windows 10, you can buy the product key and can get a original DVD and then type your product key here. You can also manually activate it later on from your Windows 10 Desktop. So currently i'll be using a trial copy so we’ll be selecting I don’t have a product key.


Now select the Operating System and click on Next. For best performance and exciting features, we’ll be using Windows 10 Pro and will also suggest you the same.


Accept the license agreement and click on Next button.


Select Custom: Install Windows only (advanced).

If there's any existing partitions, make sure to delete all the partitions. In this case, the drive is new and is unallocated.

Select XXXXX and click on Next

Now Windows will copy files. This process will take some time.


After installation, your system will restart and continue the installation process.

Now here’s the settings. If you want to use Windows 10 existing/default express settings, you can use it or you can change the settings manually. To use the custom settings, click on Customize settings and you can choose the options. So i’ll be using the express settings.

Now it’s time to create an User Account for this PC. Fill in the Account details and click on Next.


In next few minutes, you’ll be on your Desktop.

Step 9: Configure Post Installation for Windows 10

Now the next step is to configure post installation for your Windows 10.

You’ll need to install some drivers like Audio, Ethernet, Graphics, either that is Intel HD, NVIDIA or AMD and other hardware which you’re using with your system.

Step 1: Configure Graphics (NVIDIA Drivers)

Now insert your second USB Flash Drive on which you copied the Post Installation Tools and Fixes.

Open your USB Flash Drive and copy the NVIDIA Driver to your Desktop. As a guide, we’ll be only installing NVIDIA Driver as it’s mandatory for Graphics performance and acceleration. But it’s recommended to install all the required drivers for your system.

Be sure to use the x64 Bit version on your Windows 10 and be sure to select Windows 10 version otherwise if you’ll use the previous version, the NVIDIA drivers are not going to work.

Open the Setup and proceed through the installation.


Now all the fixes have been applied. The Post installation has been completed successfully for Windows 10. The macOS High Sierra has been installed already.

Now eject your second USB Flash Drive and Shut Down your PC.
 

EliteMacx86

Administrator
Staff member
Joined
Jul 22, 2018
Motherboard
GIGABYTE Z370 AROUS GAMING 3
CPU
Intel Core i9 9900K
Graphics
2xAMD RX 580 8GB
OS X/macOS
10.15.x
Bootloader
Clover (UEFI)
Mac
MacBook Pro
Mobile Phone
Android, iOS
Configure System for Multi Boot

Step 2: Configure PC for Dual Boot

Connect your macOS drive back.
Start your PC
Press DEL key to enter your BIOS Menu. Navigate to BIOS Features Tab and change the first boot option to the UEFI OS internal drive instead of the Windows Boot Manager.

Select your Hard Drive with UEFI Prefix so that the Clover boots first.

Go to Save & Exit Tab and Save the changes and exit the UEFI BIOS.

Step 10: Restart your System!

After restarting your PC, it will boot to Clover Welcome screen automatically. You can choose between which OS to Boot either Windows or macOS.

And you're done!
Multi Boot on Separate Drive is just how simple it is.
 

EliteMacx86

Administrator
Staff member
Joined
Jul 22, 2018
Motherboard
GIGABYTE Z370 AROUS GAMING 3
CPU
Intel Core i9 9900K
Graphics
2xAMD RX 580 8GB
OS X/macOS
10.15.x
Bootloader
Clover (UEFI)
Mac
MacBook Pro
Mobile Phone
Android, iOS
Multi Booting Windows and macOS on two separate drives is simple as Multi Booting Windows and macOS on single drive.
(See https://www.elitemacx86.com/threads/guide-mulit-boot-windows-and-macos-uefi-on-single-drive.112/)

This guide explains Multi Boot Windows and macOS on two separate drives. Multi Booting on two separate drives is the best way to multi boot. The current release is Ubuntu and macOS High Sierra. Ubuntu and High Sierra will be used for this guide.

This guide is bit lengthy so has been divided into 5 chapters.
The chapters includes.

Requirements
  • 3x USB Flash Drive for Windows, macOS, Ubuntu and Post-Installation
  • A working Internet connection to download the files.

Step 1: Creating macOS Installation USB

The very first step is to create the Installation USB for macOS High Sierra. To create Installation USB for macOS Sierra, follow the guide here.

Step 2: Creating Windows 10 Bootable USB

Now after creating macOS High Sierra Installation USB, the next step is to create a Bootable USB for Windows 10. You've two ways to create the Bootable USB either on Windows or Mac.

If you're having a system running Windows, follow the guide here.

If you're having access to Mac, follow the guide here.

Step 3: Copy Post installation tools and NVIDIA Web Drivers

Insert your third USB Flash Drive and copy the necessary drives for Windows, and tools and kexts for Mac. Once the network is enabled, you can continue with the progress.

So now as you’re having macOS High Sierra Installation USB, Windows 10 Bootable USB and the post installation tools and drivers, so you’re ready to Multi Boot on your computer.

Step 4: BIOS Settings
If you're installing on a desktop with AMI UEFI, the options are simple. For other systems using a different vendor, make sure to set your BIOS or UEFI to Optimized Defaults, and the SATA Mode to AHCI.

Here's a Recommended BIOS/UEFI Settings for Optimal performance.

To access your BIOS/UEFI, press and hold Delete key on your Keyboard. The key maybe different in your case. Refer to your Motherboard Guide/Manual.
  • Set Optimized Defaults.
  • Set X.M.P. Memory Profile to Profile 1 (Optional, if using a High Frequency RAM).
  • Set Windows 8/10 Features to Other OS.
  • Set Network Stack to Disabled.
  • Set Secure Boot to Disabled.
  • Set Intel Platform Trust Technology (PTT) to Disabled.
  • Set XHCI Hand-Off to Enabled.
  • Set SATA Mode to AHCI.
  • Set Internal Graphics to Auto.
  • If your system has a VT-d Option, Disable it.
  • If your system has Intel Virtualization Technology, Enable it.
  • If your system has Serial Port, Disable it.
  • If your system has Parallel Port, Disable it.
  • If your system has Fast Boot Option, Disable it.
  • Save & Exit Setup.
Note :
  • If you're using a external Graphics Card for your build, such as NVIDIA or AMD GPU, set Initial Display Output to PCIe Slot 1
Step 6: Installing macOS High Sierra

Now the next step is to install macOS Sierra. Follow How to Install macOS High Sierra for this guide. Please be sure to follow the appropriate guide as per your build.

Also will recommend to complete each specific install at one time to avoid confusions and hassle free installation.

Once the post installation is completed for macOS, Shut Down your PC.
 
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