No subject

indeterminate state for the entire PEB.  Writing all zero's to the
header as in Artem's fix should work in all cases excluding the
extremely rare cases where a write of 0's is interrupted and the header
has been changed to a valid value and in the case where an erase
(0-to-1) transition is interrupted which results in a valid header.  The
odds against that are huge, so I would expect the flash to wear out
before it ever happens in real life.

-Eric