Guide: MultiBooting UEFI

[Going Bald]

If I already have a fully functional macOS Sierra install on my machine and want to install windows alongside it then I wouldn't need both USB's to perform every step of the process, right? With the Windows USB I'm all set, correct?

Correct. Recommend you use separate drive for Windows.

 

[Stompyy]

Correct. Recommend you use separate drive for Windows.

Unfortunately I only have 1 SSD for Operating Systems and a HDD for media, might grab an SSD later, but can't now unfortunately. Are there many stability issues installing both on the same drive?

Also, my previous question was in regards to this:

Now, to make everything work right, shutdown Ubuntu, insert the OS X USB installer again and boot to OS X desktop.

If I boot with the usb how would I go to macOS, wouldn't I go to the macOS installer?

 

[Going Bald]

Unfortunately I only have 1 SSD for Operating Systems and a HDD for media, might grab an SSD later, but can't now unfortunately. Are there many stability issues installing both on the same drive?

Also, my previous question was in regards to this:



If I boot with the usb how would I go to macOS, wouldn't I go to the macOS installer?

No, you go to the Clover screen from which you can choose the installer icon, the OS X icon or the Penguin icon for Ubuntu

 

[Stompyy]

No, you go to the Clover screen from which you can choose the installer icon, the OS X icon or the Penguin icon for Ubuntu

So the first answer you gave me is sorta wrong, correct? Even if I already have macOS Sierra up and running I would need 2 usb sticks to do the whole process, right? 1 for installing windows and the other only to do what you said above.

 

[Going Bald]

So the first answer you gave me is sorta wrong, correct? Even if I already have macOS Sierra up and running I would need 2 usb sticks to do the whole process, right? 1 for installing windows and the other only to do what you said above.

You need a USB installer for each OS. 1 + 1 = 2
You can install either Win10 or Mac OS first, but if you install Clover on the HDD before you install Win10, Windows will overwrite Clover files. If you format drive with Win10 installer and install Win10 first, the EFI partition will be 100MB - too small for Mac OS (must be 200MB or larger).
Simplest procedure - boot Mac OS installer, format/partition drive. Install Mac OS. Shutdown, boot with Win10 installer and install Win10. Whutdown, boot with Mac OS installer, select the drive Mas OS icon and hit enter to boot to Mac OS desktop.
Once at desktop install Clover. Rename the Windows boot file in the EFI partition.

 

[Stompyy]

You need a USB installer for each OS. 1 + 1 = 2
You can install either Win10 or Mac OS first, but if you install Clover on the HDD before you install Win10, Windows will overwrite Clover files. If you format drive with Win10 installer and install Win10 first, the EFI partition will be 100MB - too small for Mac OS (must be 200MB or larger).
Simplest procedure - boot Mac OS installer, format/partition drive. Install Mac OS. Shutdown, boot with Win10 installer and install Win10. Whutdown, boot with Mac OS installer, select the drive Mas OS icon and hit enter to boot to Mac OS desktop.
Once at desktop install Clover. Rename the Windows boot file in the EFI partition.

Oh, I think I gotcha now. correct me if I'm wrong please.

I am now writing from Sierra fully installed, lets say I install win10 on its dedicated partition on this same drive, it would still overwrite macOS files/bootloader and if I don't rename the boot loader it will automatically boot into windows, right ? As there is no way to get to clover to rename it, I need the macOS USB ONLY to boot into clover and boot Sierra from my SSD, right? I don't need to actually boot off the usb since that would take me to the installer, correct?

Just picturing everything before I do the whole procedure to avoid any issues.

PD: It's no problem if the macOS usb I have is 10.12.3 and I'm running 10.12.4 since I updated, correct?

 

[Going Bald]

Mostly correct. You actually boot off the installer USB to get to the Clover screen to select your already installed MacOS icon to boot to desktop. No problem using the USB to boot either version.

 

[Stompyy]

Mostly correct. You actually boot off the installer USB to get to the Clover screen to select your already installed MacOS icon to boot to desktop. No problem using the USB to boot either version.

Awesome, glad I finally understood why I needed the 2 USB's if I already had one OS fully installed.

Last question, I know the optimal would be a dedicated drive, but since I'm unable to do that as of now, how is the stability/performance of having both in the same nvme ssd?

 

[Going Bald]

Awesome, glad I finally understood why I needed the 2 USB's if I already had one OS fully installed.

Last question, I know the optimal would be a dedicated drive, but since I'm unable to do that as of now, how is the stability/performance of having both in the same nvme ssd?

Stability/performance is OK, but updating/upgrading can be a PITA.

 

[Stompyy]

I pretty much screwed things up apparently.

I was up and running Sierra with no issues, created the UEFI USB with this settings in Rufus: D1sdzFW.png. (took the screenshot from another site as clearly I used a 32gb usb stick and not 4gb, but those are the settings I used).

Created successfully the disk partition, assigned 160gb for win10 and the rest for Sierra.

Booted into win10 installer, deleted the partition created on macOS, pressed "next" on the free space and got this: http://i.imgur.com/l1dRVNF.jpg

Rebooted and I saw that the partition was no longer free space. Gave the button "Format" a try on this partition and then pressed next. This happened: vX9F2M0.jpg

Now I deleted all partitions and resized my SSD to its original size, 256gb, so I'm starting from scratch. Any tips as to what went wrong?