(19)
(11) EP 0 000 946 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.03.1979 Bulletin 1979/06

(43) Date of publication A2:
07.03.1979 Bulletin 1979/05

(21) Application number: 78100748

(22) Date of filing: 25.08.1978
(84) Designated Contracting States:
DE FR GB SE

(30) Priority: 31.08.1977 US 829312

(71) Applicant: Hewlett-Packard Company
 ()

(72) Inventor:
  • McKnight, Robert N.
     ()

   


(54) Apparatus for controlling the movement of the data head in a moving-head data recording system


(57) Two servoing functions, both operating from the data reading and recording transducer, are performed in a high performance movinghead disc drive. One servo rapidly moves the head from its current track to any other track utilizing absolute track identifying addresses recorded in the inter-sector gap between data sectors. Once located on a track, the other servo maintains head location precisely over the center of that track while data is being read or recorded employing track following information also recorded in the inter-sector gap. The resolution of transducer location is enhanced by secondary use of the track following information.







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