Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2005-09-27
2005-09-27
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S075000
Reexamination Certificate
active
06950272
ABSTRACT:
A method and apparatus for reducing the acoustic output of a computer disk drive during a load or unload operation are provided. According to the invention, a pulse train having pulse widths that vary from one pulse to the next is provided to a voice coil motor while the transducer head is being loaded to or unloaded from the surface of the disk. According to one embodiment of the present invention, a proportional term equal to the inverse of the pulse width is supplied to the controller such that, with all other inputs to the controller being equal, a pulse train having pulses of equal total power are produced. By providing pulses of varying widths, the acoustic output of the disk drive is spread among multiple frequencies, and the amplitude at any one frequency is diminished as compared to a pulse train having pulses of equal width.
REFERENCES:
patent: 4864437 (1989-09-01), Couse et al.
patent: 5027241 (1991-06-01), Hatch et al.
patent: 5615064 (1997-03-01), Blank et al.
patent: 5663846 (1997-09-01), Masuoka et al.
patent: 5781363 (1998-07-01), Rowan et al.
patent: 5936788 (1999-08-01), Boutaghou et al.
patent: 6282049 (2001-08-01), Cameron et al.
patent: 6316898 (2001-11-01), Albrecht et al.
patent: 6690536 (2004-02-01), Ryan
Hiller Bernhard
Rice Mark
Yaeger Richard
Hansra Tejpal S.
Hudspeth David
Maxtor Corporation
Wong K.
LandOfFree
Method and apparatus for the acoustic improvement of the... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for the acoustic improvement of the..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for the acoustic improvement of the... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3390311