Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2009-12-14
2011-11-29
Wong, K. (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S060000
Reexamination Certificate
active
08068306
ABSTRACT:
Approaches for improving the write quality of a hard-disk drive (HDD) head experiencing temporary fly-height problem. When the hard-disk drive is idle and heads are parked on the ramp, fluid, such as a lubricant or the condensation of vapor, may collect between the surface of a platter and the head or a slider, thereby causing the head to temporarily fly higher than normal. An HDD may include electronic component(s) configured to (a) determine whether it is likely that fluid is interposed between the surface of a magnetic-recording disk and the slider or the head, and (b) temporarily adjust one or more of (i) a thermal fly height control setting of the head and (ii) a write parameter of the head to compensate for the head flying higher than normal as a result of the fluid being interposed between the surface of the disk and the slider or the head.
REFERENCES:
patent: 5831781 (1998-11-01), Okamura
patent: 5991113 (1999-11-01), Meyer et al.
patent: 6501606 (2002-12-01), Boutaghou et al.
patent: 6853508 (2005-02-01), Smith et al.
patent: 7095578 (2006-08-01), Ma
patent: 7362533 (2008-04-01), Stipe
patent: 7375914 (2008-05-01), Dieron et al.
patent: 7400473 (2008-07-01), Krajnovich et al.
patent: 7430090 (2008-09-01), Oyamada et al.
patent: 7502205 (2009-03-01), Hurtado et al.
patent: 7609473 (2009-10-01), Mate
patent: 7724463 (2010-05-01), Nakamura et al.
patent: 7808738 (2010-10-01), Mitsunaga et al.
patent: 2008210499 (2008-11-01), None
Masayuki Kurita et al., “Flying-height reduction of magnetic-head slider due to thermal protrusion,” IEEE Transactions on Magnetics, vol. 41, No. 10, Oct. 2005, available online at http://ieeexplore.ieee.org/xpls/abs—all.jsp?arnumber=1519189&isnumber=32516, printed Jun. 29, 2009.
B. Liu et al., “Low Flying-Height Slider with High Thermal Actuation Efficiency and Small Flying-Height Modulation Caused by Disk Waviness,” IEEE Transactions on Magnetics, vol. 44, No. 1, Jan. 2008, available online at http://ieeexplore.ieee.org/xpls/abs—all.jsp?arnumber=1519189&isnumber=32516.
Jen David
Ramamoorthy Lakshmi
Schouterden Kris
Shimokoshi Masayoshi
Zuercher Douglas
Brokaw Christopher J.
Hitachi Global Storage Technologies - Netherlands B.V.
Mahamedi Paradice Kreisman LLP
Wong K.
LandOfFree
Write quality of HDD heads experiencing temporary fly-height... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Write quality of HDD heads experiencing temporary fly-height..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Write quality of HDD heads experiencing temporary fly-height... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4255755