EP 0093713 A4 19850916 - TRACK IDENTIFICATION CODE RECORDING METHOD.
Title (en)
TRACK IDENTIFICATION CODE RECORDING METHOD.
Title (de)
VERFAHREN ZUR AUFZEICHNUNG EINES SPURERKENNUNGSKODES.
Title (fr)
PROCEDE D'ENREGISTREMENT DE CODES D'IDENTIFICATION DE PISTES.
Publication
Application
Priority
US 32188681 A 19811116
Abstract (en)
[origin: WO8301859A1] In a magnetic disc for a magnetic disc storage system, at least one of the surfaces of the disc being coated with a magnetic material, the disc being adapted to be mounted on a spindle for rotation relative to a magnetic transducer positioned for recording data on and retrieving data from the surface, a plurality of concentric annular tracks (2, 1, 0, 15) being defined on the surface of the disc, each of the tracks being divided into a plurality of sectors, each such sector having associated therewith prerecorded data for identification thereof, the prerecorded identification data including a track identification code, the track identification code being a unit distance code, there is disclosed a method for recording the unit distance track identification code wherein the code has a first uni-directional clock transition (61) at a fixed time in each bit cell and a second uni-directional transition (N-N) at a variable time in each bit cell, the time of the second transition relative to the first transition determining whether the data bit is a one or a zero.
IPC 1-7
IPC 8 full level
G11B 5/09 (2006.01); G11B 5/58 (2006.01); G11B 5/596 (2006.01); G11B 20/12 (2006.01); G11B 21/08 (2006.01); G11B 21/10 (2006.01); G11B 27/30 (2006.01)
CPC (source: EP)
G11B 5/59655 (2013.01); G11B 27/3027 (2013.01)
Citation (search report)
- [X] US 4027338 A 19770531 - KRIL RUSSELL STEPHEN
- [XD] FR 2417824 A1 19790914 - CII HONEYWELL BULL [FR]
- [X] GB 2060941 A 19810507 - CII HONEYWELL BULL
- [X] GB 2065335 A 19810624 - CII HONEYWELL BULL
- [X] EP 0010494 A1 19800430 - CII HONEYWELL BULL [FR]
- [A] NEUES AUS DER TECHNIK, no. 3, 15 June 1979, page 4, Würzburg, DE; "Servospurkodierungsmuster"
- [A] IEEE TRANSACTIONS ON MAGNETICS, vol. MAG-14, no. 4, July 1978, pages 182-184, New York, US; B. McKNIGHT: "A track locating servo system utilizing the data heads as absolute position transducers"
Designated contracting state (EPC)
CH DE FR GB LI SE
DOCDB simple family (publication)
WO 8301859 A1 19830526; BR 8207978 A 19831004; EP 0093713 A1 19831116; EP 0093713 A4 19850916; GB 2121654 A 19831221; GB 8317981 D0 19830803; JP S58501879 A 19831104
DOCDB simple family (application)
US 8200386 W 19820401; BR 8207978 A 19820401; EP 82901280 A 19820401; GB 8317981 A 19820401; JP 50141882 A 19820401