Hello, I will make a boot disk, that can boot from older Hardware with BIOS boot & newer hardware with EFI boot. My idea is: Partition1: EFI Boot partition /EFI/BOOT/ BOOTia32.efi /EFI/BOOT/ BOOTx64.efi ... /syslinux/ldlinux.sys ... Partition2: Linux System ... ... Also set EFI Boot Partition as active. Witch BIN file must I install on MBR ? I think mbr.bin ist the correct. For PBR (Partition Bootrecord) I use ldlinux.bss. But is this compatible with the EFI Boot FAT Partition ? Is there a way to do this, or must I patch syslinux ? Best regards Johann