Patent ID: 6208480
Filing Date: 2001-03-27
Classification: G11B

Abstract:
A headerless format disc drive comprising:a disc stack including a plurality of coaxially arranged data storage discs providing a plurality of disc surfaces, wherein a plurality of rotationally spaced apart servo frames are defined for the disc stack;servo data written on the plurality of disc surfaces within radially extending servo spokes such that each disc surface includes one servo spoke within each servo frame, and such that within each paticular servo frame the servo spokes on each of the plurality of disc surfaces are offset rotationally from one another;a plurality of data heads, wherein each of the plurality of data heads is supported by an actuator assembly adjacent a corresponding one of the plurality of disc surfaces, wherein a selected first of the plurality of data heads reads data from its corresponding disc surface until a head switch occurs, and wherein after the head switch occurs a selected second of the plurality of data heads reads data from its corresponding dics surface; andcontrol circuitry operatively coupled to the plurality of data heads and receiving the data read by the selected first data head, and after the head switch receiving the data read by the selected second data head, the control circuitry generating as a first output a first signal which is indicative of boundaries of the respective servo frames.