Science Fair Project Encyclopedia
Constant Angular Velocity
Constant Angular Velocity (CAV) refers to how information is written to or read from a rotating data disk. A typical example can be seen in one of the differences between an LP record and a compact audio disc (CD). With an LP, the disc always spins at the same angular rate (CAV) of 33⅓ rpm, so the surface of the record groove passes the needle at slower linear rate as the needle moves toward the center of the disc. Whereas, with a CD, the motor speed decreases from 495 to 212 rpm as the read head moves away from the center to keep the disc moving past the read head at a constant linear velocity (CLV).
10-26-2009 08:16:03
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details