Re: ISO installer image: GPT versus MBR partitions

[pelzflorian (Florian Pelz)]

On Wed, Apr 24, 2019 at 08:56:57AM +0200, Thomas Schmitt wrote:
> Florian Pelz wrote
> > So… GPT is wrong for some optical media too?
> 
> Not in this aspect. GPT partitions must not start at block 0.
> So the overall ISO superblock is not mountable as partition and thus
> free to claim the full image size as filesystem size.
>

Sorry, I meant to quote this aspect:

> > One can read trailing garbage not only from USB sticks but also from
> > most DVD types.
> > […]
> >
> 
> So… GPT is wrong for some optical media too?
> 


> > By the way, someone I know has a most peculiar machine called Lenovo
> > Ideapad 100S which does not boot Guix, […]
> 
> If Guix does not show up in the boot manager, try a plain grub-mkrescue
> image that was made when GRUB was configured for both EFI variations:
> 32 bit x86 and 64 x86.
> My experiments are made when it is configured for those two plus PC-BIOS.
> The EFI partition then has bootx64.efi and bootia32.efi in /efi/boot/.
> 

Will do.

Regards,
Florian