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Guide: Multibooting UEFI on Separate Drives

Joined
May 13, 2019
Messages
12
Motherboard
ASUS TUF Z390-Pro Gaming
CPU
i7-9700K
Graphics
RX 580/ RTX 2060
Mac
MacBook Pro
Mobile Phone
iOS
I have the same window and when I boot from Boot Microsoft EFI Boot from EFI, I get a black screen with the same icon on centre
 
Joined
Aug 18, 2017
Messages
3
Motherboard
MSI B150 Gaming M3
CPU
Intel Core i5-6500
Graphics
PNY GeForce GTX 1060 6GB
Currently have MacOS 10.12.6 Sierra and Windows 10 installed via UEFI on the same hard drive. Plan is to :
  • Purchase a second drive, transfer windows install over to drive 2.
  • Upgrade existing install drive to High Sierra (Nvidia) and expand the partition to take up the space that was previously taken up by the windows installation.
  • Summary:
    • Before - Drive 1: Sierra + Windows
    • After - Drive 1: Sierra (+ expand partition to take up old space of windows) | Drive 2: Windows
Suggestions on the most seamless way to do so without messing up UEFI partitions? I'm particularly worried about expanding the partition size on Drive 1 and the best way to approach this.

Thanks!
 
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