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<blockquote data-quote="BoraMurdar" data-source="post: 1025576" data-attributes="member: 2291">[USER=72227]@Raiden[/USER]My experience tells otherwise, but again there are multiple combinations.I think you can install other OSes wherever you like but keeping bootloaders on the same phisical disk is essential. I always go with parameters likemount point to /boot/efi. Crucial I think!usual ext4 formatted partitions, / (root), /boot, and /home.And the Swap at last.Modern machines should use one EFI partition to store the bootloader (usualy GRUB) read by BIOS then ROM. I ve experimented in the past with keeping secure boot ON and the only way to keep two or multiple OSes, that will not mess each other, is to put bootloder on the same physical disk and each OS installed will only update (add a new chainload entry) to existing one. Even Windows with major upgrade will not touch its EFI partition.On the other hand, while upgrading, Windows can mess the chain reaction of bootloaders if they are placed on different physical drives as it searches to make only one primary/active partition and EFI partition with deep hidden attribute. If it finds multiple ones on all attached but fixed media, it will try to find a physical disk that contains MSR partition (for no actual logical reason, but it does), and ignore other chainloading processes that comes from other media.Windows Reset option is another thing. I think it will try to reset EFI partition as well.Even if that happens BOOTICE or EasyBCD can manage to fix the boot problems, but it is unnecessary effort.</blockquote>

[QUOTE="BoraMurdar, post: 1025576, member: 2291"] [USER=72227]@Raiden[/USER] My experience tells otherwise, but again there are multiple combinations. I think you can install other OSes wherever you like but keeping bootloaders on the same phisical disk is essential. I always go with parameters like mount point to [B]/boot/efi[/B]. Crucial I think! usual ext4 formatted partitions, [B]/[/B] (root), [B]/boot[/B], and [B]/home[/B]. And the Swap at last. Modern machines should use one EFI partition to store the bootloader (usualy GRUB) read by BIOS then ROM. I ve experimented in the past with keeping secure boot ON and the only way to keep two or multiple OSes, that will not mess each other, is to put bootloder on the same physical disk and each OS installed will only update (add a new chainload entry) to existing one. Even Windows with major upgrade will not touch its EFI partition. On the other hand, while upgrading, Windows can mess the chain reaction of bootloaders if they are placed on different physical drives as it searches to make only one primary/active partition and EFI partition with deep hidden attribute. If it finds multiple ones on all attached but fixed media, it will try to find a physical disk that contains MSR partition (for no actual logical reason, but it does), and ignore other chainloading processes that comes from other media. Windows Reset option is another thing. I think it will try to reset EFI partition as well. Even if that happens BOOTICE or EasyBCD can manage to fix the boot problems, but it is unnecessary effort. [/QUOTE]

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