Questions about MTD

[Oron Ogdan]

Kyle Harris Wrote : 
> I've seen reference to "saving the bad block table" in a couple of
> places now. It seems that the file system should be able to 
> dynamically
> create/maintain the bad block table. Is this not true?
> 
No It's not true, The Bad Block table is static and should not change 
during the life cycle of the device. Just think of the possibility of
a power failure during the update to this table. 

When talking about new bad blocks that occur during the life cycle of the
device, it is very
hard to determine when a new "bad block" is really bad. Just think of 
situations such as power down, Noisy hardware etc. Our philosophy now
(in M-Systems) is marking new bed blocks only in the copy of the bad 
block table that resides in RAM. So further writes to this block will be 
prevented until the next reset. 

In the next reset, Either the block is bad and then the first write 
will fail again and further writes will be prevented, Or it's good and
then can be reused. 

Oron

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