Patent ID: 7663993
Filing Date: 2010-02-16
Classification: G11B

Abstract:
1. A disk device comprising: a recording and reproducing device which optically records information including image and voice on a disk-like recording medium, or reproduces information from said disk-like recording medium; and a rotation controller which selects a method of rotating said disk-like recording medium based on factors comprising at least (1) a type of said disc-like recording medium, and (2) a recording format with which said information is recorded on said disk-like recording medium; wherein, when said disk-like recording medium is of a first type selected from a group comprising DVD-R and BD-R, the rotation controller controls to keep a linear velocity constant with DVD Video Format; and wherein, when the disk-like recording medium is of a second type selected from a group comprising DVD-RW, the controller controls to keep (1) a linear velocity constant accompanying a replacement procedure if the information is recorded with DVD Video Format, and (2) an angular velocity constant without a replacement procedure if the information is recorded with DVD Video Recording Format.