SanDisk (SNDK) has rallied 1,500% from its IPO nearly one year ago. Peers like Micron (MU), Western Digital (WDC), and Seagate (STX) also surged in recent months. Rick Ducat showcases key levels behind the stunning rally backing the (mostly) bullish trends to keep in mind after Thursday's earnings. Options activity showed an uptick heading into the report.