McAfee (MFE) shares are up fractionally, 10c to $40.80, but there is big call buying. The August $45 calls have traded 6,458 contracts against prior OI of 1,134. The bulk of volume came in two blocks of 2,300 and 1,600 both at the ask from 75c to 65c. Implied vol. has been pushed up from 38% to $39.3% on the day.