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WDC versus SNDK the zero sum game...

I just drew a 1 yr chart of wdc and sndk, the two rivals for storage media, one HDDs the other flash.

It’s a zero sum game. One wins at the expense of the other. The underlying need for some storage medium cannot be disputed.

Yet the charts are virtually identical.

How irrational can a market get?

 

 please post 1yr graph of wdc versus sndk