Patent ID: 6707632
Filing Date: 2004-03-16
Classification: G11B

Abstract:
A disc drive having a rotatable disc to which the disc drive self-writes servo data without external reference, the servo data defining tracks on the disc and used to control the position of a rotary actuator, the rotary actuator configured for pivotal movement and supporting a read/write head adjacent the disc, the disc drive comprising:a clock head assembly, contained within the disc drive, which outputs an angular position signal indicative of the angular position of the rotatable disc, the clock head assembly remaining at a fixed radius of the disc irrespective of rotary movement of the rotary actuator; a radial position detection assembly, contained within the disc drive, which outputs a radial position signal indicative of radial movement of the rotary actuator relative to the disc; and a servo track writing control circuit, which controls the function and position of the read/write head to write servo information in relation to the angular and radial position signals, wherein the clock head assembly and the radial position detection assembly remain contained within the disc drive during subsequent field use of the disc drive by a user.