Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1997-12-05
1999-11-02
Young, W. R.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7708, G11B 5596
Patent
active
059781696
ABSTRACT:
An apparatus and associated method are disclosed for compensating for repeated servo runout error in a disc drive. The disc drive includes a disc on which servo information is arranged as a plurality of servo fields which define tracks on the disc. An actuator assembly is provided adjacent the disc and includes a head which accesses the servo fields and an actuator motor which moves the head relative to the disc. A servo circuit controls radial location of the head by applying current to the actuator motor in response to the servo information. The repeated servo runout error, caused by errors in the radial location of the servo fields on the disc, is compensated by the servo circuit through the use of compensation values which are stored in compensation fields of the servo fields. The compensation values are determined by measuring current applied to the actuator motor as the head follows a selected track, twice integrating the sequence of current measurement samples to determine a second integral of current, and using the second integral of current to determine the compensation values.
REFERENCES:
patent: 4136365 (1979-01-01), Chick et al.
patent: 4536809 (1985-08-01), Sidman
patent: 4594622 (1986-06-01), Wallis
patent: 4635141 (1987-01-01), Coulter
patent: 4679103 (1987-07-01), Workman
patent: 4691152 (1987-09-01), Ell et al.
patent: 5136439 (1992-08-01), Weispfenning et al.
patent: 5262907 (1993-11-01), Duffy et al.
patent: 5402280 (1995-03-01), Supino
patent: 5404253 (1995-04-01), Painter
patent: 5793559 (1998-08-01), Shepherd et al.
Habermehl James L
Seagate Technology Inc.
Young W. R.
LandOfFree
Repeated servo runout error compensation in a disc drive does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Repeated servo runout error compensation in a disc drive, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Repeated servo runout error compensation in a disc drive will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2143768