As reported previously, Cowen analyst Karl Ackerman downgraded Western Digital (WDC) to Market Perform from Outperform as his recent supply chain field work pointed to "substantial, unabated competitive pricing tactics" by the company and Toshiba (TOSBF) to gain share of enterprise and client solid state drives. He also worries that Western Digital's efforts to scale back incremental NAND wafer adds to support pricing is not without significant risk, Ackerman tells investors. Ackerman lowered his price target to $70 from $100 on Western Digital shares, which are down about 3% to $63.20 in pre-market trading.