calculate trailing and forward PE again, I think your math is incorrect. I think WDC is also a good stock to buy right here. I think STX and MRVL are better but I don't think you can go wrong with WDC either.
Forgot to mention that WDC is taking market share from STX (has been for a couple years now).
Ignore these facts at your own peril.
While there is extreme pessimism towards the HDD market in general. Mutual Fund managers are going to recognize that WDC is a safer investment due to the valuation and the extremely good balance sheet.