I reinstalled Manjaro (Gnome / 21.0) for full disk encryption.
After the reinstall on the same internal NVME Disk, I cannot access the second internal NVME for boot my Windows 10. It’s shown in the Lenovo Bootmanager, but stucks in some kind of loop and dies on a screen before showing anything from the Win boot process like the splash.
Ah I see. You share one efi partition. In general it works that way if everything is default, but to be secure, better use one little efi partition for each OS. So each OS will not touch each other, but grub can still find other OS’s on other efi partitions.
Ok, it happened unintentionally. I installed Manjaro, then Win10 (then bootloader got ****** and win10 needed to be prevented with native (i think its legacy) lenovo bootloader), then I just reinstalled manjaro on this disk again.
I may try “UEFI only” in Bios next.
Is there a different option?
UEFI only is a good choice. Since Linux boots, you should create a new efi partition on sda and repair windows somehow and let it use this efi partition. But there i am not an expert. Never done it.