Patent ID: 6118633
Filing Date: 2000-09-12
Classification: G11B

Abstract:
A disk drive and disk combination for reading and recording digital information comprising:a disk capable of storing digital information comprising:only one platter consisting essentially of a planar uppermost surface, an opposing planar lowermost surface, and an inner rim surface formed therebetween, the inner rim surface receiving a protrusion of a metal disk-like portion, the platter formed of a material comprising a plastic that is contiguous between the uppermost surface and the lowermost surface;the metal disk-like portion formed of a material comprising a ferrous metal, the metal disk-like portion having an outer rim surface and a bottom metal portion enabling attraction to a clamp magnet, the bottom metal portion being at least partially uncovered by the platter, the protrusion being formed on the outer rim surface and extending therefrom, the metal disk-like portion formed integral with the only one platter such that the plastic material contiguously contacts each one of a plurality of sides of the protrusion; anda center aperture that is capable of receiving a spindle shaft of a spindle motor, wherein the metal disk-like portion has a top metal surface that is coplanar with the platter uppermost surface and a bottom metal surface is coplanar with the platter lowermost surface;a spindle motor having a spindle motor shaft capable of at least partial insertion into the center aperture of the platter and having a clamp magnet coupled to the spindle motor capable of chucking the metal disk-like portion;a transducer capable of reading and recording digital information stored on the disk; andan actuator capable of positioning the transducer.