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Magnetic recording disk drive with rotational vibration compensation

一种盘驱动器、磁记录的技术，应用在磁记录、数据记录、记录信息存储等方向，能够解决没有解决噪声等问题

Inactive Publication Date: 2010-03-24
HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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Problems solved by technology

Also, this RVFF approach does not address the issue of noise due to off-axis sensitivity and board vibration

Method used

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  • Magnetic recording disk drive with rotational vibration compensation
  • Magnetic recording disk drive with rotational vibration compensation
  • Magnetic recording disk drive with rotational vibration compensation

Examples

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Embodiment Construction

[0014] figure 1 is a block diagram of a magnetic recording hard disk drive according to the present invention. The disk drive includes a magnetic recording disk 12 that is rotated about an axis of rotation 13 in direction 15 by a spindle motor (not shown) mounted to a disk drive housing or base 16 . A printed circuit board 19 is attached to the housing 16 and supports the disk drive electronics. Disk 12 has a magnetic recording layer patterned into magnetizable blocks defining concentric data tracks (eg, typically tracks 50, 51) and servo sectors (eg, typically servo sectors 60, 61, 62). The servo sectors typically extend radially across the concentric data tracks such that each data track has a plurality of equally angularly spaced servo sectors extending around the track. Each servo sector in a data track typically contains a servo timing mark (STM) indicating the start of the servo sector, a track identification (TID) code, and a portion of a pattern of magnetized blocks...

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Abstract

A disk drive and a method for operating the disk drive compensates for rotational vibration (RV) by adaptively modifying the gains of two separate linear vibration sensors so the sensor gains are optimal under any given condition. The two sensors provide two signals S1, S2, respectively, to the disk drive's servo control processor that generates the control signal to the voice coil motor (VCM) actuator that controls the positioning of the read / write head. The processor uses S1, S2 and the head position error signal (PES) as inputs to run an adaptive RV feedforward (RVFF) algorithm. The adaptive RVFF algorithm takes the PES and sensor outputs S1 and S2 as inputs, mathematically determines the required correction to the sensor gain factors k1 and k2, respectively, and then adjusts the gain factors k1 and k2 accordingly. Each signal S1, S2 is then modified by its adjusted gain factor k1, k2, respectively. The difference in the modified S1, S2 signals is the RVFF signal that is summed withthe control signal to generate the RV-compensated control signal to the VCM actuator.

Description

technical field [0001] The present invention relates generally to magnetic recording disk drives, and more particularly to disk drives including a system for canceling the effects of rotational vibration. Background technique [0002] Magnetic recording hard drives use actuators, generally, rotary voice coil motor (VCM) actuators, for positioning the read / write head over the data track of the recording disk. The disk drive has a servo control system that receives a position error signal (PES) from the servo position information read by the heads from the data tracks and generates VCM control signals to maintain the heads on the tracks and move them to the position for data read. and write on the desired track. [0003] Disk drives experience rotational vibration and disturbance forces during normal operation. These disturbances are internal (such as due to the movement of the VCM actuator) and external (such as due to shocks to the frame supporting the disk drive, or when ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/48G11B5/55
CPCG11B5/59627G11B5/5582
Inventor 黄富盈仙波哲夫孙晓天
Owner HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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