Disc starts spinning around 500 rpm and Frequent Linear Velocity (CLV) servo is activated to take care of accurate velocity. CLV servo takes advantage of a PLL to lock to clock transitions derived from data study off of disc. Data is derived from the+B+C+D. (A buffered Model of this sign http://garrettybdde.bloginder.com/2648461/the-ultimate-guide-to-colorado-learn-to-sew