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this post was submitted on 25 Aug 2023
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Linux
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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On EFI systems all bootloaders are supposed to reside on a single partition. EFI does not support multiple 'EFI system partitions', so operating systems have to share a single one. And this is usually not a problem if it is the one Windows choose. The problem most often is broken EFI firmware which fails to correctly handle adding and removing boot entries. Or Windows, which fails to boot if anything changes (disk order and such), even though everything is still available.
This is technically only true if you have a single disk. The EFI spec allows for a single EFI partition per disk, so you can definitely have multiple in a system. I know this, because my setup has multiple EFI partitions. Windows doesn't like it, and it will try it's hardest to share a single one with Linux, but if it's on its own disk, you can set it up with its own EFI partition using the command prompt.
This is exactly why I put my Linux install on a separate SSD. I even physically removed the windows SSD when I installed so nothing would get merged together.
Then my recent research was wrong - I tried to make it work and failed. Then read somewhere it is not supported. But it can be that it is valid EFI configuration, but not supported by Windows and some firmware implementations.
I don't think I have ever seen an EFI firmware which was not broken in one way or another.
Ohh could you share how to do that? I resorted to removing the other drive physically
It was a couple months ago that I set this all up, but this is the article I followed IIRC: https://woshub.com/how-to-repair-deleted-efi-partition-in-windows-7/
I literally reinstalled Windows the other day and
systemd-bootwas still working, and so was Windows. This is all on a single disk.