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1. WO2000042602 - HEAD SWITCH SEEK ON DISC DRIVES WITH MULTIPLE RECORDING HEADS

Publication Number WO/2000/042602
Publication Date 20.07.2000
International Application No. PCT/US2000/001013
International Filing Date 14.01.2000
Chapter 2 Demand Filed 15.08.2000
IPC
G11B 21/08 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
21Head arrangements not specific to the method of recording or reproducing
02Driving or moving of heads
08Track changing or selecting
CPC
G11B 21/083
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
21Head arrangements not specific to the method of recording or reproducing
02Driving or moving of heads
08Track changing or selecting
081Access to indexed tracks or parts of continuous track
083on discs
G11B 5/5556
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
54with provision for moving the head into or out of its operative position or across tracks
55Track change, selection or acquisition by displacement of the head
5521across disk tracks
5552using fine positioning means for track acquisition separate from the coarse (e.g. track changing) positioning means
5556with track following after a "seek"
Applicants
  • SEAGATE TECHNOLOGY LLC [US/US]; 920 Disc Drive Scotts Valley, CA 95067-0360, US
Inventors
  • NG, Weiloon; SG
  • DING, Mingzhong; SG
  • WONG, Patrick, T.; SG
Agents
  • DEMPSTER, Shawn, B.; Seagate Technology, Inc. - SHK2LG 1280 Disc Drive Shakopee, MN 55379-1863, US
Priority Data
60/116,00915.01.1999US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) HEAD SWITCH SEEK ON DISC DRIVES WITH MULTIPLE RECORDING HEADS
(FR) RECHERCHE PAR COMMUTATION DE TETES DANS DES UNITES DE DISQUE COMPORTANT PLUSIEURS TETES ENREGISTREUSES
Abstract
(EN)
A disk drive includes a base and a disc rotatably attached to the base. The disc drive also includes an actuator assembly (120) rotatably attached to said base and a device for moving the actuator assembly. The disc drive includes servo circuitry and a controller for controlling movement of the actuator and head switches during track seek operations. The disc drive determines the average seek time for each head (150) and also measures the amount of time for head switch from the transducer head having the shortest average seek time to all the other transducing heads in the disc drive. When a seek is performed, the controller in the disc drive determines if the shortest average seek time plus the seek time from the transducing head to the transducing head on the surface containing the target track and sector is less than the average seek time of the head on the surface having the target track and sector.
(FR)
L'invention concerne une unité de disque qui comprend un socle et un disque fixé rotatif sur le socle, ainsi qu'un ensemble (120) actionneur fixé rotatif sur le socle et un dispositif pour déplacer l'ensemble actionneur. L'unité de disque comprend également un circuit d'asservissement et un contrôleur pour contrôler le mouvement de l'actionneur et les commutations des têtes durant les opérations de recherche de pistes. L'unité de disque détermine le temps de recherche moyen pour chaque tête (150) et mesure le temps nécessaire pour commuter une tête entre la tête du transducteur présentant le temps de recherche moyen le plus court et toutes les autres têtes de transduction de l'unité de disque. Lorsqu'une recherche est effectuée, le contrôleur intégré à l'unité de disque détermine si le temps de recherche moyen le plus court additionné du temps de recherche entre la tête de transduction et celle placée sur la surface comportant la piste et le secteur cibles est inférieur au temps de recherche moyen de la tête placée sur ladite surface comportant la piste et le secteur cibles.
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