 Shares of Western Digital Corp. WDC, -0.03 dropped 2.1 in premarket trading Thursday, after the data storage company reported fiscal first-quarter profit that was well below expectations even as revenue beat, and also provided a downbeat outlook for the current quarter. Net income fell to 27 million, or 8 cents a share, from 610 million, or 1.93 a share, in the year-ago period. 