Patent ID: 7151734
Filing Date: 2006-12-19
Classification: G11B

Abstract:
1. An optical disc player for reading an optical disc having a first side and a second side, each side having a respective first data layer, wherein data is arranged on said first side along a first spiral oriented in a first direction, and wherein data is arranged on said second side along a second spiral oriented in a direction that is opposite said first spiral when viewed on the respective sides, each side having several annular regions said optical disc player comprising: a first laser head reading data from said first side along said first spiral; a second laser head reading data from said second side along said second spiral; a laser head controller that controls the accessing movement of said laser heads to position said laser heads independently from each other within the same region of respective sides of the disc to provide random access to any data segment within said region; and a motor rotating said disc at one of several speeds in accordance with the position of said heads.