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A multi-disk install builds one LUKS container per drive joined into a single multi-device BTRFS (-d single -m raid1). nixos-generate-config only emits boot.initrd.luks.devices for the main drive — every subvolume mounts through /dev/mapper/crypted_main, so the other members are invisible to it. The installed system then unlocked only the main drive, the array never assembled, and boot hung. Invisible single-disk, fatal multi-disk (matches a real-hardware report). generate_flake_config now writes, into hardware-selection.nix, a boot.initrd.luks.devices entry for each extra drive (UUID resolved via disko's partlabel; mapper name mirrors disko-config.nix's sanitize) and re-asserts the x-systemd.requires= mount options disko sets but which nixos-generate-config strips. Verified end-to-end in a 3-disk UEFI QEMU VM: reproduced the bug, applied the fix, ran a real nixos-install onto the array, and rebooted from the disks — one passphrase unlocked all three containers, the 3-device BTRFS assembled, and the system reached login. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>