Faster Track Centerline Acquisition After Seek for a Personal Computer Hardfile
Original Publication Date: 1986-Nov-01
Included in the Prior Art Database: 2005-Mar-09
This article describes a technique to reduce the amount of time required to reach the track centerline in a computer hardfile if misregistration exists. Presently, some hardfiles do not have the capability to determine the magnitude of track misregistration. The only information available to the drive microprocessor is the direction of this misregistration. This information is conveyed to the microprocessor by a signal called "offtrack sense". The value of offtrack sense (1 or 0), which is sampled at index time, informs the drive whether the misregistration is inward or outward from the actual track centerline. In response to this signal, the drive microprocessor makes an incremental correction in the position of the heads to move them towards the true track centerline.