Re: NAND flash misery



David Brown wrote:

Vladimir Vassilevsky wrote:

The flash write endurance (as stated by the manufacturers) is at the order of millions of cycles. This is more then enough for many applications; there is really no point to bother about the wear leveling. The problem I am
facing is the infant mortality of the unreliable cells.


Write endurance is not normally in the millions for NAND flash - perhaps you are thinking of NOR flash, which is inherently more reliable (but costs more per bit)?

Millions of cycles is what stated in the datasheets for the finished devices like flash cards or jump drives. We can only guess what methods are actually employed inside. Perhaps the wear leveling is taken care off. However the reliability appears to be surprisingly low, especially for the higher capacity devices.


Vladimir Vassilevsky
DSP and Mixed Signal Design Consultant
http://www.abvolt.com
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