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Technology Stocks : WDC/Sandisk Corporation

WDC 286.53

+6.1%

2:26 PM EST

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To: NHP who wrote (27131)	12/14/2004 2:06:32 PM
From: Pam	Read Replies (1) of 60323

Hi NHP, Multi-level cells basically has four layers on the floating gate and each of these levels has to be metered precisely and charges stored in each during programming. Intel pioneered this process technology and markets it as Strataflash. Multi-level cell technology can be very unreliable if not manufactured precisely because of the difficulty in metering the voltages in the various cell levels. It will become even more difficult to produce at finer geometries. Having said that it will be extremely difficult to incorporate more levels than we currently have which is what the document you referred to discusses. Competing with MLC is what they call Multi-bit cells (Saifun, AMD, IFX) marketed as Mirror-bit. Here the cell is basically split in the middle and each cell then is then independently charged and drained. Much more reliable and relatively easier to manufacture, I believe. -Pam

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