Apparatus for recording data on magnetic record medium
AssigneeSony Corporation
InventorHajime Ito
Life of this patent
Estimating the term…
Abstract
To ensure an overwrite characteristic for a magnetic disk and restrain the occurrence of waveform distortion. When record data (updated data) is recorded on a target area of a magnetic disk, a dc erase is effected to thereby ensure a requested overwrite characteristic. Next, erasing data of a constant frequency is recorded i.e., an intermediates wavelength erase is accomplished. Then, the record data is recorded. Since the erasing data is recorded before the recording of the record data, a magnetized pattern corresponding to the erasing data is formed over a recording layer (magnetic film) as a bed and waveform distortion is restrained from occurring due to the execution of the dc erase alone.
Claims6
A magnetic recording apparatus for use with a magnetic record medium, the magnetic recording apparatus comprising:
- a magnetic head for applying a magnetic field to the magnetic record medium to form a magnetized pattern on the magnetic record medium thereby recording record data;
- conversion means for converting input data into the record data having a predetermined frequency range;
- and
- control means for controlling said magnetic head so as to apply a DC magnetic field to a record area of the magnetic record medium, to apply to said record area a magnetic field that is inverted at a constant period corresponding to an intermediate frequency within said predetermined frequency range, and to apply to said record area a magnetic field that is inverted in accordance with the record data, when said magnetic head records the record data on the record area.
A method of recording record data on a predetermined area of a magnetic record medium, comprising the steps of:
- applying a DC magnetic field to the predetermined area with a magnetic head;
- applying to the predetermined area, with the magnetic head, a magnetic field that is inverted at a constant period to an intermediate frequency within a frequency range of the record data;
- and
- applying to the predetermined area, with the magnetic head, a magnetic field that is inverted in accordance with the record data.
Dependencies are inferred from the claim text.