Comment 14 for bug 1062737

Hi,

> I've built a test image now using the cherry-picked patch from 1.2.5,
> and confirmed that the -partition_offset option now happily coexists
> with -isohybrid-gpt-basdat

Thanks a lot for testing.

> However, as the resultant image still appears to not have a valid MBR
> partition table, there doesn't seem to be any advantage to adding this
> option back to our builds for 12.10. So I think we'll leave it as is
> with -partition_offset 16 disabled for now.

Do you rather mean "no valid GPT" ?
The MBR seems to be ok now. After all it made the difference
between boot and not-boot.

The GPT is there but it usually not recognized because the MBR
is not trivial enough (not a "protective MBR"). This should have
nothing to do with -partition_offset.
If it has, then this would be probably another bug.

I googled a bit and found:
  http://www.rodsbooks.com/gdisk/hybrid.html
The described "Hybrid MBR" would differ from mjg's mainly by the
type of the first MBR partition: 0xee rather than 0x00 im mjg's.

So does it help GPT visibility to set byte 450 of the ISO image
to the value 0xee ? (Byte count starting at 0)

Have a nice day :)

Thomas