Title:
【発明の名称】複数の埋設型4連サーボフィールドを用いるディスクドライブシステム
Document Type and Number:
Japanese Patent JPH05501170
Kind Code:
A
Abstract:
A quadrature based embedded servo control system is provided to realize a high track density, high-performance hard disk drive system. Each data sector includes a gray code field spanning the entire width of the data track and a quad-servo burst pattern having first, second, third, and fourth servo burst fields distributed along the length of a portion of the data sector. The center point of the first, second, third, and fourth servo bursts are sequentially offset from the adjacent burst by a radial distance equivalent to one-half of the data track width. The quad-servo burst pattern is used with a track-following algorithm based on the quadrature value of (A+B)-(C+D) to obtain a substantially increased servo lock range. A second gray code field extending substantially the width of the data track and second quad-servo burst pattern substantially identical to the first is provided near a mid-point in the data portion of the data sector to increase the servoing information sample rate and accuracy, thereby permitting substantially increased data track densities to be utilized.
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Inventors:
Shrinkle Lewis Jay
Squires John Pee
Squires John Pee
Application Number:
JP51046290A
Publication Date:
March 04, 1993
Filing Date:
July 11, 1990
Export Citation:
Assignee:
Seagate Technology LLC
International Classes:
G11B5/596; G11B21/10; (IPC1-7): G11B21/10
Attorney, Agent or Firm:
Akira Asamura (3 outside)