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Magnetic recording disk drive with write current overshoot amplitude responsive to data transitions

A disk drive, write drive technology used in HDD. field

Inactive Publication Date: 2016-05-04
HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Difficulty generating correct write current pulses with certain data bit patterns

Method used

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  • Magnetic recording disk drive with write current overshoot amplitude responsive to data transitions
  • Magnetic recording disk drive with write current overshoot amplitude responsive to data transitions
  • Magnetic recording disk drive with write current overshoot amplitude responsive to data transitions

Examples

Experimental program
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Effect test

Embodiment Construction

[0013] figure 2 is a top plan view of a head / disk assembly (HDA) of a hard disk drive 10 that may incorporate an embodiment of the present invention. The disc drive 10 includes a rigid base 12 that supports a spindle 14 that supports a stack of discs, including a top platter 16 . The spindle 14 is rotated by a spindle motor (not shown) to rotate the magnetic disk in the direction indicated by the curved arrow 17 . Disk drive 10 also includes a rotary actuator assembly 40 rotatably mounted to base 12 at pivot point 41 . The actuator assembly 40 is a voice coil motor (VoiceCoilMotor, VCM) actuator, which includes a magnetic assembly 42 and a voice coil 43 installed on the base 12 . When energized by a control circuit (not shown), the voice coil 43 moves and thus rotates the E-block 24 with the attachment arm 22 and load beam assembly 20 to position the head 29 to the data track on the disk. Each load beam assembly 20 has an Integrated Lead Suspension (ILS) 30 connected to a ...

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PUM

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Abstract

A disk drive dynamic wave shaper (DWS) write driver includes a write current generator that produces a baseline output current for the write current pulses and an overshoot current generator that produces an overshoot current with different values. The overshoot current is added to the baseline current, with the value of the overshoot current amplitude (OSA) being selected in response to the frequency of transitions in the write data signal. The write driver includes logic circuitry that detects the pattern of transitions. Transitions that are immediately followed by a transition will receive a larger-than-nominal OSA1, transitions that are not immediately followed by a transition and that are not preceded by a long sequence of non-transitions will receive a nominal OSA2, and transitions after longer sequences of non-transitions will receive a smaller-than-nominal OSA3.

Description

technical field [0001] The present invention relates generally to magnetic recording Hard Disk Drives (HDDs), and more particularly to HDDs that optimize analog write current pulses in response to frequency transitions in data to be written to disk. Background technique [0002] HDDs typically include a main integrated circuit, which is typically a System-on-a-chip (SOC) containing numerous electronics and firmware for the HDD. The SOC receives digital data to be written to the disk and passes it to the read preamplifier / write driver integrated circuit (preamplifier IC). The preamplifier IC is typically located on the arm of the actuator that moves the read / write head to the selected data track on the disk. Data written by the write head is sent from the SOC to the preamplifier IC, where the write driver generates analog write current pulses that are used in the induction coil in the write head to selectively magnetize the magnetic medium of the recording layer on the disk....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/02G11B20/10
CPCG11B5/02G11B20/10018G11B5/59616
Inventor J·康特雷拉斯S·Y·加佐恩W·M·汉森R·A·扎凯
Owner HITACHI GLOBAL STORAGE TECH NETHERLANDS BV