Re: debugging grub2

[daggs]

Greetings Pascal,

> Sent: Wednesday, September 05, 2018 at 10:44 PM
> From: "Pascal Hambourg" <address@hidden>
> To: address@hidden
> Subject: Re: debugging grub2
>
> 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.
I stand corrected.

> 
> > $ fdisk -l /nfs_home/home/dagg/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.
I'm booting from a virtual optical cd, I'm not burning the image.
actually, that explains why I see it as (hd0) on the other machine. 
interesting... I think I know why it isn't working.
thanks for the info.

Dagg.