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Hi, i think i found the reason for the boot failure in the definition of Extended Boot Records. https://en.wikipedia.org/wiki/Extended_boot_record#Values "Starting sector = relative offset between this EBR sector and the first sector of the logical partition. Note: This is often the same value for each EBR on the same hard disk; usually 63 for Windows XP or older." So if

...al partition, but the chainloaded operating system has no way of knowing that." I.e. SYSLINUX in 2008 expected the forwarded partition entry to be patched by the chainloader (GRUB) so that its start LBA bears the absolute block address of the partition start. Much newer (2014) is https://sfxpt.wordpress.com/2014/02/17/chainloading-extlinux-from-grub/ but it refers to quotes of hpa from 2006: http://www.syslinux.org/archives/2006-October/007590.html One would have to find out whether GRUB2 meanwhile offers an opportunity to do this manipulation in "DS:SI" before it chainloads...

...ating system has no way > of knowing that." > > I.e. SYSLINUX in 2008 expected the forwarded partition entry to be patched > by the chainloader (GRUB) so that its start LBA bears the absolute block > address of the partition start. > > Much newer (2014) is > https://sfxpt.wordpress.com/2014/02/17/chainloading-extlinux-from-grub/ > but it refers to quotes of hpa from 2006: > http://www.syslinux.org/archives/2006-October/007590.html > > One would have to find out whether GRUB2 meanwhile offers an opportunity > to do this manipulation in "DS:SI&qu...