Hi,

Luis Speciale a écrit :
> > > (hd0) (hd0,gpt6)(hd0,gpt5)(hd0,gpt4)(hd0,gpt3)(hd0,gpt2)(hd0,gpt1) (hd1)

Pascal Hambourg wrote:
> > Obviously hd0 is the internal disk. So hd1 must be the USB drive.

Indeed, hd0 has too many partitions to be the unchanged ISO.
The ISO has 2 and no "protective" MBR partition of type 0xee, which would
indicate GPT.

But hd1 has too few partitions. I'd expect GRUB2 to ignore the GPT of the ISO
and maybe the MBR partition 1 of type 0x00. But MBR partition 2 with
type 0xef should show up.

I replay by booting a grub-mkrescue CD-ROM with Debian ISO as payload disk

  qemu-system-x86_64 -enable-kvm -m 512 \
                     -boot order=d -cdrom grub-mkrescue-original.iso \
                     -hda debian-9.1.0-amd64-netinst.iso

It shows on (hd0) : 
  (hd0,apple2), (hd0,apple1), (hd0,msdos2)
I guess apple1 is the APM Block0 aka Driver Descriptor Map. Then apple2
would be the EFI system partition marked by APM partition1, the same as
is marked by msdos2.


> > I wonder if the image was properly copied. Can
> > you check the partition table on the USB drive ?

Maybe it's simply not that USB stick. (I had to lookup man qemu to find out
how to force booting from -cdrom when -hda is bootable, too.)


> I don't see how I can do this.

How many hard-disk-like storage devices does the computer have ?
Would the bootable USB stick be the second or the third "disk" ?
Is it plugged in when GRUB starts ?


Have a nice day :)

Thomas

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