Investors are showing a sense of bullishness towards storage device-maker Seagate Tech (STX) Tuesday. Shares are up 17 cents to $9.03 and call volume has been steady in the first hour of trading. The early action surfaced in July 8 calls, but has since expanded to include July 9, July 10, Sep 9, and Sep 10 calls. 3,850 contracts traded total (compared to 182 puts). While the volume seems to include buyers and sellers, implied volatility is moving higher (to 56, from about 55 the day before), suggesting increasing demand for STX calls is driving up options premiums.