Re: debugging grub2

[Pascal-liste]

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.