$WDC is one of biggest losers #stocks today. read more:

Western Digital Corporation (symbol: WDC) was one of the worst losers of
the trading day today (2016-07-29), losing -11.53%. The number of shares
that changed hands was 17,649,852, or about 3 times the average daily
volume in the stock.
The closing price was $47.51, amounting to a market cap of $11,070,000,000,
about -45.26% off the highest price in the last 12 months. The stock has
been trading at a range between $34.99 and $86.8.
WDC is in the Electronic Components industry, part of the Technology sector.
Looking at its valuation, the stock is now trading at 13.42 times earnings.