grub and bios in installation











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1
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favorite












Why does "device for bootloader" must be /dev/sda instead of /dev/sda1 or /dev/sda2 ?
Is it that grub can't be installed on a partition ?



How does bios recognize the bootable devices ? Is it that installation write into bios ?



Thank you,
ranran






grub2 system-installation bios







share|improve this question






















  • If a BIOS based system, BIOS boots from the MBR, or very first sector of a hard drive. It cannot directly read a partition. New UEFI systems boot from an ESP - efi system partition. Parts of grub are in boot loader location, parts may be hidden and grub menu is in your /boot/grub/grub.cfg. gnu.org/software/grub/manual/grub/grub.html#Introduction
    – oldfred
    Nov 27 at 16:39















up vote
1
down vote

favorite












Why does "device for bootloader" must be /dev/sda instead of /dev/sda1 or /dev/sda2 ?
Is it that grub can't be installed on a partition ?



How does bios recognize the bootable devices ? Is it that installation write into bios ?



Thank you,
ranran






grub2 system-installation bios







share|improve this question






















  • If a BIOS based system, BIOS boots from the MBR, or very first sector of a hard drive. It cannot directly read a partition. New UEFI systems boot from an ESP - efi system partition. Parts of grub are in boot loader location, parts may be hidden and grub menu is in your /boot/grub/grub.cfg. gnu.org/software/grub/manual/grub/grub.html#Introduction
    – oldfred
    Nov 27 at 16:39













up vote
1
down vote

favorite









up vote
1
down vote

favorite











Why does "device for bootloader" must be /dev/sda instead of /dev/sda1 or /dev/sda2 ?
Is it that grub can't be installed on a partition ?



How does bios recognize the bootable devices ? Is it that installation write into bios ?



Thank you,
ranran






grub2 system-installation bios







share|improve this question













Why does "device for bootloader" must be /dev/sda instead of /dev/sda1 or /dev/sda2 ?
Is it that grub can't be installed on a partition ?



How does bios recognize the bootable devices ? Is it that installation write into bios ?



Thank you,
ranran






grub2 system-installation bios




grub2 system-installation bios






share|improve this question













share|improve this question











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asked Nov 27 at 16:18









ransh

175117




175117












  • If a BIOS based system, BIOS boots from the MBR, or very first sector of a hard drive. It cannot directly read a partition. New UEFI systems boot from an ESP - efi system partition. Parts of grub are in boot loader location, parts may be hidden and grub menu is in your /boot/grub/grub.cfg. gnu.org/software/grub/manual/grub/grub.html#Introduction
    – oldfred
    Nov 27 at 16:39


















  • If a BIOS based system, BIOS boots from the MBR, or very first sector of a hard drive. It cannot directly read a partition. New UEFI systems boot from an ESP - efi system partition. Parts of grub are in boot loader location, parts may be hidden and grub menu is in your /boot/grub/grub.cfg. gnu.org/software/grub/manual/grub/grub.html#Introduction
    – oldfred
    Nov 27 at 16:39
















If a BIOS based system, BIOS boots from the MBR, or very first sector of a hard drive. It cannot directly read a partition. New UEFI systems boot from an ESP - efi system partition. Parts of grub are in boot loader location, parts may be hidden and grub menu is in your /boot/grub/grub.cfg. gnu.org/software/grub/manual/grub/grub.html#Introduction
– oldfred
Nov 27 at 16:39




If a BIOS based system, BIOS boots from the MBR, or very first sector of a hard drive. It cannot directly read a partition. New UEFI systems boot from an ESP - efi system partition. Parts of grub are in boot loader location, parts may be hidden and grub menu is in your /boot/grub/grub.cfg. gnu.org/software/grub/manual/grub/grub.html#Introduction
– oldfred
Nov 27 at 16:39










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In BIOS mode, the computer system looks for a bootloader in the very head end of the computer, which is pointed to by /dev/sdx, while /dev/sdxn points to the head end of partition n in drive x.



If you have a bootloader in very head end of the computer (MBR), you can chainload to the head end of a partition (PBR), and in this case it can be useful to install a (second) bootloader there.



If you do not want to overwrite the head end of a partition (MBR), you can write to the head end of partition (PBR) without chainloading. Later on you can run sudo update-grub in the main operating system and get grub menuentries for the new (dual- or multi-boot) operating system.






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    In BIOS mode, the computer system looks for a bootloader in the very head end of the computer, which is pointed to by /dev/sdx, while /dev/sdxn points to the head end of partition n in drive x.



    If you have a bootloader in very head end of the computer (MBR), you can chainload to the head end of a partition (PBR), and in this case it can be useful to install a (second) bootloader there.



    If you do not want to overwrite the head end of a partition (MBR), you can write to the head end of partition (PBR) without chainloading. Later on you can run sudo update-grub in the main operating system and get grub menuentries for the new (dual- or multi-boot) operating system.






    share|improve this answer

























      up vote
      0
      down vote













      In BIOS mode, the computer system looks for a bootloader in the very head end of the computer, which is pointed to by /dev/sdx, while /dev/sdxn points to the head end of partition n in drive x.



      If you have a bootloader in very head end of the computer (MBR), you can chainload to the head end of a partition (PBR), and in this case it can be useful to install a (second) bootloader there.



      If you do not want to overwrite the head end of a partition (MBR), you can write to the head end of partition (PBR) without chainloading. Later on you can run sudo update-grub in the main operating system and get grub menuentries for the new (dual- or multi-boot) operating system.






      share|improve this answer























        up vote
        0
        down vote










        up vote
        0
        down vote









        In BIOS mode, the computer system looks for a bootloader in the very head end of the computer, which is pointed to by /dev/sdx, while /dev/sdxn points to the head end of partition n in drive x.



        If you have a bootloader in very head end of the computer (MBR), you can chainload to the head end of a partition (PBR), and in this case it can be useful to install a (second) bootloader there.



        If you do not want to overwrite the head end of a partition (MBR), you can write to the head end of partition (PBR) without chainloading. Later on you can run sudo update-grub in the main operating system and get grub menuentries for the new (dual- or multi-boot) operating system.






        share|improve this answer












        In BIOS mode, the computer system looks for a bootloader in the very head end of the computer, which is pointed to by /dev/sdx, while /dev/sdxn points to the head end of partition n in drive x.



        If you have a bootloader in very head end of the computer (MBR), you can chainload to the head end of a partition (PBR), and in this case it can be useful to install a (second) bootloader there.



        If you do not want to overwrite the head end of a partition (MBR), you can write to the head end of partition (PBR) without chainloading. Later on you can run sudo update-grub in the main operating system and get grub menuentries for the new (dual- or multi-boot) operating system.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Nov 27 at 16:39









        sudodus

        22.2k32871




        22.2k32871






























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