grub-install no disco mbr híbrido

Question

Eu segui o guia muito detalhado para fazer um registro híbrido de MBR (GPT / MBR) tirado de aqui

Agora, gdisk diz que tenho mbr híbrido. Mas eu só posso inicializar em UEFI e não posso fazer isso no BIOS (eu uso disco rígido externo). Parece que a execução simples de grub-install instala apenas a parte uefi. Eu vi a discussão sobre o requisito de que a entrada de proteção fosse a primeira no disco, então eu a fiz a primeira e que não é a causa raiz.

Então a questão é como instalar o GRUB para que ele inicie o sistema operacional tanto a partir do BIOS / MBR quanto do UEFI / GPT?

$ sudo gdisk / dev / sdd

GPT fdisk (gdisk) version 1.0.1

Partition table scan:
  MBR: hybrid
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with hybrid MBR; using GPT.

Command (? for help): r

Recovery/transformation command (? for help): o

Disk size is 468862128 sectors (223.6 GiB)
MBR disk identifier: 0x7213C4A0
MBR partitions:

Number  Boot  Start Sector   End Sector   Status      Code
   1                     1       208895   primary     0xEE
   2      *         208896      1196031   primary     0x83
   3               1196032    135413759   primary     0x83
   4             200425472    468860927   primary     0x83

Recovery/transformation command (? for help): p
Disk /dev/sdd: 468862128 sectors, 223.6 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): 21773ad9-3d43-4832-85b7-6c841d20ce75
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 468862094
Partitions will be aligned on 1-sector boundaries
Total free space is 62183 sectors (30.4 MiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1              63           80324   39.2 MiB    EF00  Basic data partition
   2          208896         1196031   482.0 MiB   8300  Basic data partition
   3         1196032       135413759   64.0 GiB    8300
   4       135413760       168968191   16.0 GiB    0700  Basic data partition
   5       168968192       200425471   15.0 GiB    0700  Basic data partition
   6       200425472       468860927   128.0 GiB   8300
   7           81920          149503   33.0 MiB    EF02

$ sudo parted / dev / sdd

GNU Parted 3.2
Using /dev/sdd
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print
Model: ATA OCZ-VECTOR150 (scsi)
Disk /dev/sdd: 240GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number  Start   End     Size    File system     Name                  Flags
 1      32.3kB  41.1MB  41.1MB  fat32           Basic data partition  boot, esp
 7      41.9MB  76.5MB  34.6MB                                        bios_grub
 2      107MB   612MB   505MB   ext4            Basic data partition
 3      612MB   69.3GB  68.7GB  ext4
 4      69.3GB  86.5GB  17.2GB  linux-swap(v1)  Basic data partition  msftdata
 5      86.5GB  103GB   16.1GB  ntfs            Basic data partition  msftdata
 6      103GB   240GB   137GB   ext4

$ sudo grub-install

Installing for x86_64-efi platform.
Installation finished. No error reported.

    

Answer 1

How to install GRUB so it would boot OS both being started from BIOS/MBR and UEFI/GPT?

Você deve criar uma partição de inicialização do bios labled bios_grub . Esta partição precisa ser criada antes da instalação do GRUB.

For GRUB to boot from a GPT-partitioned disk on a BIOS-based system, a BIOS boot partition is required. Please note that this partition is unrelated to the /boot mountpoint, and will be used by GRUB directly. Do not create a filesystem on it, and do not mount it.

Como criar a partição de inicialização do bios ? Qual é o tamanho mínimo?

When creating a BIOS Boot Partition on a GPT system, you should make sure that it is at least 31 KiB in size. (GPT-formatted disks are not usually particularly small, so we recommend that you make it larger than the bare minimum, such as 1 MiB, to allow plenty of room for growth.) You must also make sure that it has the proper partition type. Using GNU Parted, you can set this using a command such as the following:

parted /dev/disk set partition-number bios_grub on