Guide: Multibooting UEFI on Separate Drives

[Going Bald]

Of course I did only use one of the two programs to partition the drive. I'm sorry if I described my approach unclear.
DU is not an option as it doesn't recognize my SM961 (NMVe drive needs special kexts, which I didn't 'install' yet)

In diskpart: I don't know exactly how to convert a drive to GPT format nor to create an EFI partition.
Are there special command for this? I just learned the basics, like creating new partition (with chosen size) and setting the filesystem for it.
Iwould really appreciate if you could write down the commands in diskpart for the steps you mentioned. Always exciting to learn more

Process goes like this:
- boot Windows installer USB
- at first screen press Shift+F10 to get command prompt (hit enter after each line to type)
- type: diskpart
- type: list disk (so you're certain of the disk you're working with, say it is disk 0)
- type: select disk 0
- type: clean (don't blame me if you don't know what this does - hope there was nothing on that drive you wanted to save)
- type: convert gpt
- type: create partition efi size=200
- type: format quick fs=fat32 label="EFI"
- type: exit
- type: exit

 

[CyrusHD]

So I ended up creating a Rufus Win10 install and clean installing both OSes again exactly as your separate drives guide describes. It worked the first boot and I went straight into Windows 10, then it grinder to a half, went really slow and I had to reboot. Coming back into Clover Bootloader again, it stopped working and hung on the NO SIGNAL again. Any ideas?

 

[Farodo]

Process goes like this:
- boot Windows installer USB
- at first screen press Shift+F10 to get command prompt (hit enter after each line to type)
- type: diskpart
- type: list disk (so you're certain of the disk you're working with, say it is disk 0)
- type: select disk 0
- type: clean (don't blame me if you don't know what this does - hope there was nothing on that drive you wanted to save)
- type: convert gpt
- type: create partition efi size=200
- type: format quick fs=fat32 label="EFI"
- type: exit
- type: exit

thank you, Sir!
Although my mess did work for me as well I decided to do it right once and for all and with your idiot-proof (mrgreen) step by step instructions this was really easy

 

[CyrusHD]

And if it means anything to you, Windows will boot from Clover using the Windows 8 BIOS mode, but Sierra either doesn't or boots really glitchy and all setting change? Sierra will boot from Clover with the Other OS option, but Windows has the problems as stated previous

 

[Going Bald]

And if it means anything to you, Windows will boot from Clover using the Windows 8 BIOS mode, but Sierra either doesn't or boots really glitchy and all setting change? Sierra will boot from Clover with the Other OS option, but Windows has the problems as stated previous

Double check BIOS settings.

 

[CyrusHD]

Double check BIOS settings.

Do you have any idea what the settings should be? Tried to go off the latest installation guide but no luck

 

[LoveGamers]

Process goes like this:
- boot Windows installer USB
- at first screen press Shift+F10 to get command prompt (hit enter after each line to type)
- type: diskpart
- type: list disk (so you're certain of the disk you're working with, say it is disk 0)
- type: select disk 0
- type: clean (don't blame me if you don't know what this does - hope there was nothing on that drive you wanted to save)
- type: convert gpt
- type: create partition efi size=200
- type: format quick fs=fat32 label="EFI"
- type: exit
- type: exit

I tried this with 850 Evo and I get a "This operation is not support on removable media." error when I try to format. Does anyone know why this might be?

Disregard, ran it again and it worked perfectly. Thanks!

Sadly, I'm still getting the error "Windows detected that the EFI System partition was formatted as NTFS. Format the EFI System partition as FAT32, and restart the installation."

There's another EFI partition for macOS on my other drive, could this be the reason this is happening?

 

[Going Bald]

I tried this with 850 Evo and I get a "This operation is not support on removable media." error when I try to format. Does anyone know why this might be?

Disregard, ran it again and it worked perfectly. Thanks!

Sadly, I'm still getting the error "Windows detected that the EFI System partition was formatted as NTFS. Format the EFI System partition as FAT32, and restart the installation."

There's another EFI partition for macOS on my other drive, could this be the reason this is happening?

If you followed post #121 your EFI partition would not be formatted NTFS. Says right there
- type: create partition efi size=200
- type: format quick fs=fat32 label="EFI"

 

[LoveGamers]

If you followed post #121 your EFI partition would not be formatted NTFS. Says right there
- type: create partition efi size=200
- type: format quick fs=fat32 label="EFI"

Thanks for the response, however I followed the directions to a T. The problem was the installer kept going off of my other EFI partition on my other drive. Once I got rid of the other EFI partition it ran fine, however I did have to reinstall macOS on that drive but it's been smooth ever since.

 

[Going Bald]

Thanks for the response, however I followed the directions to a T. The problem was the installer kept going off of my other EFI partition on my other drive. Once I got rid of the other EFI partition it ran fine, however I did have to reinstall macOS on that drive but it's been smooth ever since.

Yes, this can be a problem with Windows installer if other drives are connected. Next time make sure the Windows drive is connected to P0 in UEFI/BIOS or is connected to the first port in the default drive order list.