Disk drive with controlled actuator oscillation for release of h

Details Disk drive with controlled actuator oscillation for release of h Disk drive with controlled actuator oscillation for release of h

1993-09-08

1995-01-24

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 9701, G11B 2102

Patent

active

053846753

ABSTRACT:
A magnetic recording disk drive has a startup routine that frees the recording head carriers and moves them to a parking location, such as load/unload ramp or a disk landing zone, if they are stuck to the disks when the drive motor is attempted to be started. If the drive motor does not achieve its operating speed at normal startup of the disk drive, thus indicating that static friction or other "stiction" forces are adhering the carriers to the disks, a series of alternating current pulses is applied to the actuator to dither the carriers at an initial frequency that is generally equal to or above the resonant frequency of the actuator system with stuck carriers. The frequency and amplitude of the pulses is swept downward from the initial frequency and amplitude and repeated until the drive motor rotates at its operating speed. The alternating current pulses that perform the dithering of the carriers have different amplitudes or durations so that a net force is applied to the actuator to move the carriers to the parking location.

REFERENCES:
patent: 4530021 (1985-07-01), Cameron
patent: 4589036 (1986-05-01), Bertschy et al.
patent: 4970610 (1990-11-01), Knappe
patent: 5018029 (1991-05-01), Ekhoff et al.
M. K. Hill et al., "Start/Stop Life Enhancement By Actuator Preload", IBM Technical Disclosure Bulletin, vol. 21, No. 12, May 1979, p. 4992.
S. Yamamoto, "Hard Disk Drive Spindle Motor Excitation Function", IBM Technical Disclosure Bulletin, vol. 32, No. 3B, Aug. 1989, pp. 40-41.
Anonymous, "Start Routine for Rigid Magnetic Disk Drives", Research Disclosure, No. 329, Sep. 1991.
Japan Abstract 62-71075 Suzuki Apr. 1, 1987 Detecting Mechanism For Sticking of Magnetic Head to Magnetic Disk.
Japan Abstract 1-171172 Kawamura Jul. 6, 1989 Control System For Magnetic Disk Drive.
Japan Abstract 02-81379 Akagi Mar. 22, 1990 Sticking Releasing System Between Head and Disk.

Affiliated with

Also associated with

Rating

Disk drive with controlled actuator oscillation for release of h does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Disk drive with controlled actuator oscillation for release of h, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Disk drive with controlled actuator oscillation for release of h will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1471768