Abstract:
Delay clock track read back data to compensate time variance due to disk thermal expansion in spiral servo track writing are provided to compensate the movement of indexes due to the thermal expansion of a disc, thereby improving the precision of spiral servo tracks used to record radial servo patterns. A clock head reads a clock track of a disc. A circumference index detector(106) is coupled to the clock head. A radial index detector(104) is coupled to the head of a hard disc drive. A phase detector(102) is coupled to the circumference index detector and the radial index detector. A delay line circuit(108) is coupled to the phase detector, the clock head, and the circumference index detector. A controller is coupled to the radial index detector and the circumference index detector.
Abstract:
Aerodynamic forces contribute to disk and actuator vibration leading to track positioning errors in storage devices such as hard disk drives. The invention provides a variety of dampening mechanisms and a method of dampening to alleviate these problems.
Abstract:
PURPOSE: A device and a method for dampening disc vibration of a storing device are provided to improve the head positioning and reduce the fluttering of a disc rotating in a storing device. CONSTITUTION: A disc drive for dampening vibration of a storing device includes first and second discs(12), disc bases(100), an actuator providing first and second recording-reproducing head assemblies respectively connected to first and second disc surfaces of the first and second discs for communication and coupled with the disc base to pivot, spindle motors(80) stably coupled with the disc bases for rotating the discs around rotation shafts at operation rotation speeds, and a dampening mechanism(120) having a plate fixedly attached to the disc base and a first dampening surface separated from the first disc by a first gap for securing the discs with at least 175 degrees with respect to the rotation shafts and a radial width of at least 16mm with respect to the shafts.