Abstract: In accordance with various embodiments, a rotatable member is mounted to a spindle hub so that initial servo data previously provided to the rotatable member are eccentrically offset with respect to a rotational center of the spindle hub. Compensation vales are determined to characterize said offset, after which final servo data are provided to the rotatable member in relation to the initial servo data and the determined compensation values. The final servo data are nominally concentric with the rotational center of the spindle hub.

Abstract: In accordance with various embodiments, initial servo data are written to a storage medium as a series of radially overlapped spiral segments. Final servo data are thereafter written to the medium while concurrently servoing on said overlapped segments.

Abstract: Preferred embodiments of the present invention are generally directed to the writing of first servo data to a medium, detecting a velocity integrated position of said first servo data, and writing second servo data in relation to the detected position of the first servo data.

Abstract: Various embodiments of the present invention allow for the generation of at least one estimated value of a first parameter that is derived from a regularly measured value of a second parameter. In addition, a single control feedback signal can be adjusted via updating of the estimated and regularly measured values in a control feedback loop. At least one spiral track can be written to storage media based on the single control feedback signal, where the single control feedback signal can be received from an compensating circuit that receives the at least one estimated value of the first parameter, which can refer to position, and the at least one regularly measured value, which can refer to velocity.

Abstract: An apparatus and associated method for preconditioning an elastomeric stop member to create a stabilized reference position for a moveable member by repetitively biasing the moveable member against the stop member and using the stabilized reference position to initiate a writing of servo data by the moveable member to a storage surface.

Abstract: A deformable, insertable device for relieving intraocular pressure comprising a body portion composed of a biocompatible porous material, said body portion comprising a first end portion and a second end portion, said body portion defining pores therethrough, said pores being of such size and quantity as to permit drainage of fluid from the anterior chamber to the scleral tissue without collapse of the anterior chamber; and