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Re: debugging grub2

From: Pascal-liste
Subject: Re: debugging grub2
Date: Wed, 5 Sep 2018 21:37:47 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

Le 05/09/2018 à 21:14, daggs a écrit :

el torito format has partitions, see;

No. El Torito is just a bootable format extension for ISO 9660. It does not provide partitions.

$ fdisk -l /nfs_home/home/eial/CentOS-7-x86_64-DVD-1804.iso

Disk /nfs_home/home/dagg/CentOS-7-x86_64-DVD-1804.iso: 4470 MB, 4470079488 
bytes, 8730624 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x4c545524

                                            Device Boot      Start         End  
    Blocks   Id  System
/nfs_home/home/dagg/CentOS-7-x86_64-DVD-1804.iso1   *           0     8730623   
  4365312    0  Empty
/nfs_home/home/dagg/CentOS-7-x86_64-DVD-1804.iso2            2368       20343   
     8988   ef  EFI (FAT-12/16/32)

This is the DOS partition table in the MBR of the ISO-hybrid image. It is used only when the image is written to a disk, thumbdrive or flash card. It is not part of El Torito and ignored (by EFI/BIOS firmwares) when the image is written on optical media.

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