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1. WO2000043993 - METHOD AND APPARATUS FOR SERVO DATA SYNCHRONIZATION IN A DISC DRIVE

Publication Number WO/2000/043993
Publication Date 27.07.2000
International Application No. PCT/US2000/001439
International Filing Date 20.01.2000
Chapter 2 Demand Filed 31.07.2000
IPC
G11B 5/596 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
48Disposition or mounting of heads relative to record carriers
58with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
596for track following on disks
CPC
G11B 5/59611
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
48Disposition or mounting of heads ; or head supports; relative to record carriers
58with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
596for track following on disks
59605Circuits
59611Detection or processing of peak/envelop signals
G11B 5/5965
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
48Disposition or mounting of heads ; or head supports; relative to record carriers
58with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
596for track following on disks
59633Servo formatting
5965Embedded servo format
Applicants
  • SEAGATE TECHNOLOGY LLC [US/US]; 920 Disc Drive Scotts Valley, CA 95066, US
Inventors
  • MORRIS, John, C.; US
  • CVANCARA, Dustin, M.; US
Agents
  • MAGEE, Theodore, M.; Westman, Champlin & Kelly, P.A. Suite 1600 International Centre 900 Second Avenue South Minneapolis, MN 55402-3319 , US
Priority Data
60/117,15325.01.1999US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHOD AND APPARATUS FOR SERVO DATA SYNCHRONIZATION IN A DISC DRIVE
(FR) PROCEDE ET APPAREIL DE SYNCHRONISATION DE DONNEES D'ASSERVISSEMENT DANS UN LECTEUR DE DISQUES
Abstract
(EN)
A method and apparatus are provided for positioning a head (110) based on a control signal and a cancellation signal. In the method and apparatus, a sensor (212) located in the disc drive (100) is capable of generating sensor data samples (308) at a sensor data rate that is different from a servo data rate. A data enlarger (316) inserts additional data samples between the sensor data samples to produce enlarged data that is filtered (318) to produce filtered data, which is decimated (322) to form decimated sensor data at the servo data rate. A cancellation component (200) converts the decimated sensor data into a cancellation signal that may be combined with a control signal to control the actuator (208). A sensor chip (300) is also provided that includes a sensing element (304) and a sigma-delta circuit (306) that cooperate to generate sensor samples at a sensor data rate and a buffer (310) that stores sensor samples at the sensor data rate.
(FR)
La présente invention concerne un procédé et un appareil de positionnement de tête (110) reposant sur un signal de commande et un signal d'annulation. Dans ces procédé et appareil, un capteur (212) placé dans le lecteur de disque (100) est capable de générer des échantillons de données de capteur (308) à un débit binaire de capteur différent d'un débit binaire d'asservissement. Un agrandisseur de données (316) introduit de nouveaux échantillons de données entre les échantillons de données de capteur pour produire des données agrandies qui sont d'abord filtrées (318) afin de former des données filtrées, puis décimées (322) afin de former des données de capteur décimées, au débit binaire d'asservissement. Un composant d'annulation (200) transforme les données de capteur décimées en signal d'annulation pouvant être combiné avec un signal de commande pour commander l'actionneur (208). En outre, une puce de capteur (300) contenant un élément de capteur (304) et un circuit sigma-delta (306) coopère pour générer des échantillons de capteur à un débit binaire de capteur, et un tampon (310) qui mémorise les échantillons de capteur à un débit binaire de capteur.
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