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1. (WO1997016010) SYNCHRONOUS DETECTION OF WIDE BI-PHASE CODED SERVO INFORMATION FOR DISK DRIVE
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1997/016010 International Application No.: PCT/US1996/016781
Publication Date: 01.05.1997 International Filing Date: 17.10.1996
IPC:
G11B 5/55 (2006.01) ,G11B 5/596 (2006.01) ,G11B 20/10 (2006.01) ,G11B 20/18 (2006.01) ,G11B 21/08 (2006.01) ,G11B 27/30 (2006.01) ,H04L 25/49 (2006.01)
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
48
Disposition or mounting of heads relative to record carriers
54
with provision for moving the head into, or out of, its operative position or across tracks
55
Track change, selection, or acquisition by displacement of the head
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
48
Disposition or mounting of heads relative to record carriers
58
with 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
596
for track following on discs
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
20
Signal processing not specific to the method of recording or reproducing; Circuits therefor
10
Digital recording or reproducing
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
20
Signal processing not specific to the method of recording or reproducing; Circuits therefor
10
Digital recording or reproducing
18
Error detection or correction; Testing
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
21
Head arrangements not specific to the method of recording or reproducing
02
Driving or moving of heads
08
Track changing or selecting
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
27
Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
10
Indexing; Addressing; Timing or synchronising; Measuring tape travel
19
by using information detectable on the record carrier
28
by using information signals recorded by the same method as the main recording
30
on the same track as the main recording
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
L
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25
Baseband systems
38
Synchronous or start-stop systems, e.g. for Baudot code
40
Transmitting circuits; Receiving circuits
49
using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels
Applicants:
QUANTUM CORPORATION [US/US]; 500 McCarthy Boulevard Milpitas, CA 95035, US
Inventors:
LEIS, Michael, D.; US
PATAPOUTIAN, Ara; US
VEA, Mathew, P.; US
EHRLICH, Richard, M.; US
FISHER, Kevin, D.; US
HENSON, James, A.; US
AKIN, William, R., Jr.; US
Agent:
HARRISON, David, B. ; Quantum Corporation 500 McCarthy Boulevard Milpitas, CA 95035, US
Priority Data:
08/724,97703.10.1996US
60/006,01323.10.1995US
Title (EN) SYNCHRONOUS DETECTION OF WIDE BI-PHASE CODED SERVO INFORMATION FOR DISK DRIVE
(FR) DETECTION SYNCHRONE D'INFORMATIONS D'ASSERVISSEMENT A CODAGE BIPHASE LARGE POUR UNITE DE DISQUE
Abstract:
(EN) A magnetic disk drive (10) data storage disk (16) defines recording tracks divided into data sectors by narrow servo spokes. A data sector lying between servo spokes is recorded with user data encoded in accordance with a code having a predetermined distance and user data code rate. Each servo spoke of the recording area has at least one servo information field encoded in a wide bi-phase code pattern. The disk drive (10) further includes a synchronous sampling data detection channel having a data transducer head (26) positioned by a servo-controlled actuator (67) over the recording track, a preamplifier (28) for receiving electrical analog signals magnetically induced by the data transducer head (26) from flux transitions present in at least the servo information field, a digital sampler (46) for synchronously sampling the electrical analog signals to produce digital samples, and wide bi-phase decoding circuitry (52) coupled to receive digital samples from the synchronous sampling data detection channel for decoding the wide bi-phase code pattern.
(FR) Disque (16) de stockage de données pour unité (10) à disque magnétique qui définit des pistes d'enregistrement divisées en secteurs de données par des rayons d'asservissement étroits. Un secteur de données se trouvant entre des rayons d'asservissement est enregistré, les données utilisateur étant codées selon un code ayant une distance et un débit de code de données utilisateur prédéterminé. Chaque rayon d'asservissement de la zone d'enregistrement possède au moins un champ d'informations d'asservissement codé dans un modèle de code biphasé large. L'unité (10) de disque comporte en outre une voie de détection de données d'échantillonnage synchrone dotée d'une tête (26) de transducteur de données placée par un actionneur (67) à servocommande au-dessus de la piste d'enregistrement, un préamplificateur (28) destiné à recevoir des signaux analogiques électriques induits magnétiquement par la tête (26) de transducteur de données à partir de transitions de flux présentes dans le champ d'informations d'asservissement, un échantillonneur numérique (46) destiné à échantillonner de manière synchrone les signaux analogiques électriques pour produire des échantillons numériques et un circuit de décodage biphasé large (52) couplé pour recevoir des échantillons numériques du canal de détection de données d'échantillonnage synchrone pour décoder de modèle de code biphasé large.
Designated States: AU, CA, CN, JP, KR, SG
European Patent Office (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
SG45665EP0804846JP3926391 JPH10512703CN1193436CA2208074
KR1019987001173AU1996074578