<P> There are two types of disk rotation methods: </P> <Ul> <Li> constant linear velocity (used mainly in optical storage) varies the rotational speed of the optical disc depending upon the position of the head, and </Li> <Li> constant angular velocity (used in HDDs, standard FDDs, a few optical disc systems, and vinyl audio records) spins the media at one constant speed regardless of where the head is positioned . </Li> </Ul> <Li> constant linear velocity (used mainly in optical storage) varies the rotational speed of the optical disc depending upon the position of the head, and </Li> <Li> constant angular velocity (used in HDDs, standard FDDs, a few optical disc systems, and vinyl audio records) spins the media at one constant speed regardless of where the head is positioned . </Li>

References to each file on a disk are stored in a