SanDisk (SNDK) is up 45 cents to $10.21 and not far from session highs ahead of a presentation today (2:40 ET) at the Goldman Sach Tech and Internet conference. Directional sentiment in the options market seems very bullish, amid heavy trading in Mar 11, Mar 12, Apr 11, and April 13 calls. Looks like buyers dominating the action. Implied volatility in the March atm call is 88 percent, up from 84 the day before.