Patent ID: 6154441
Filing Date: 2000-11-28
Classification: G11B

Abstract:
An optical storage system including a disc drive and an optical media having a low radial total indicated runout, the optical media comprising:a disc substrate having a center hole, the disc substrate including a formatted surface and central region, wherein the central region is located between the formatted surface and the center hole;a disc alignment mechanism located within the central region and having a center axis, wherein the formatted surface is concentrically registered and the concentric registration of the formatted surface is specified relative to the disc alignment mechanism; anda hub having a hub center hole, the hub secured to only one side of the disc substrate and including a hub center wherein the hub center is precisely located concentric with the center axis of the disc alignment mechanism such that the hub center hole is centered relative to the disc alignment mechanism using the disc alignment mechanism in a separate centering process, wherein the hub is not receivable by the disc alignment mechanism; andthe disc drive comprising:a drive spindle: anda center pin extending from the drive spindle for centering the drive spindle to the optical media.