On Saturday, February 20, Miod Vallat wrote:
quoted text
> 
> There's a huge difference between garbage in the mbr, and user error
> causing two partitions to be marked as active.

From the point of view of the MBR, not really.  They're both
corruption.  One just happens to be more likely to be survivable,
but since we have no checksums/etc to doublecheck the validity
of the MBR, they both amount to garbage.  One just happens to be
a tad more palatable.

--Toby.