Truth be told, a survey of leading biotech stocks currently in the IBD 50 actually accentuates the importance of using both daily and weekly charts in the same manner as, say, the mega-cap leaders such as Sandisk, Micron Technology, and Western Digital in the data storage segment. The concept also applies to other tech leaders such as Marvell Technology in application-specific integrated circuits, and Ciena, a fiber-optic data networking company. Marvell carries a $140 billion market cap, and Ciena is valued at $76 billion.