Re: NAND flash misery
On Jun 27, 11:10 am, Vladimir Vassilevsky <antispam_bo...@xxxxxxxxxxx>
wrote:
Guess how many bad blocks are typical for NAND flash of several GB
capacity? As many as 2 percent! There could be the whole areas of
hundreds of megabytes of the contiguous bad cells, as well as the random
scatter.
FWIW, for an 4GB flash device, 2% would be 80MB.
You'll also notice that most (all?) flash manufactures follow the
"1GB=1,000,000,000 bytes" rule common for disk drives. Leaves them
plenty of space (6.8%, in fact) for manufacturing defects and wear
leveling.
.
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