Sampled servo code format and system for a disc drive

Details Sampled servo code format and system for a disc drive Sampled servo code format and system for a disc drive

1986-11-26

1989-04-18

Faber, Alan

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7814, 360135, G11B 558

Patent

active

048232122

ABSTRACT:
The system and method for normalizing the amplitude of servo code derived signals in a disc drive, includes an improved embedded servo code format of separate magnetic dibit fields, recorded in half track steps. One magnetic dibit field is an automatic gain control field in which the magnetic head sees the same amount of magnetic dibit regardless of its position with respect to the track. A fast settling AGC loop responding to signals from the AGC field, produces a gain adjust signal while the magnetic head is still in the AGC field, which is used to normalize the amplitude of all following servo code and data code signals in that sector. The cycle of automatic gain control is repeated for each track in each sector. A sector mark following the AGC field has a magnetic dibit pattern which is fault tolerant. It is transduced in three parts to minimize error in its detection and identification and provides a timing reference for servo signals which follow. A defect dibit is recorded if the following servo gap is found to be defective during manufacture so that the next servo gap may be ignored. A track position servo code field provides signals for track following.

REFERENCES:
patent: 4297734 (1981-10-01), Laishley et al.
patent: 4297737 (1981-10-01), Andresen et al.
patent: 4412165 (1983-10-01), Case et al.
patent: 4424543 (1984-01-01), Lewis et al.
patent: 4511938 (1985-04-01), Betts
patent: 4516162 (1985-05-01), West
patent: 4524398 (1985-06-01), Fujiki
patent: 4530019 (1985-07-01), Penniman
patent: 4551776 (1985-11-01), Roalson
patent: 4602304 (1986-07-01), Fultz

Affiliated with

Also associated with

Rating

Sampled servo code format and system for 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 Sampled servo code format and system for a disc drive, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sampled servo code format and system for a disc drive will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2399833