nand oob corruption recovery

[David Updegraff]

I realize that specs say that if you wipe out mfg. bad block markers 
that there is "no way to recover them".. but...

Are there suggestions for plausibly reliable test sequences that one 
could run a nand chip thru to regenerate valid bad block markers?

Presumeably, it is insufficient to simply try to erase all blocks, 
marking failures as bad...  perhaps verified full page writes ?

Suggestions?

Thanks.

-dbu / Dave Updegraff / dave at cray.com