Patent ID: 6493161
Filing Date: 2002-12-10
Classification: G11B

Abstract:
A method of writing data in an encoding scheme on a recording medium with a write head, wherein the encoding scheme defines a plurality of bit cells on the medium and is characterized by a run-length limit of successive bit cells having a lack of a magnetic transition, the method comprising:providing a first write current in a first direction through the write head that is greater than a threshold current required to create a magnetic field that exceeds a coercivity of the recording medium, the first write current generating a write bubble that encompasses a number of bit cells that is no less than the run-length limit of the encoding scheme; providing, after the step of providing the first write current, a second write current through the write head that is less than the threshold current required to create a magnetic field that exceeds a coercivity of the recording medium; providing, after the step of providing the second write current, a third write current in a second direction opposite the first direction through the write head that is greater than the threshold current required to create a magnetic field that exceeds a coercivity of the recording medium, the third write current generating a write bubble that encompasses a number of bit cells that is no less than the run-length limit of the encoding scheme; providing after the step of providing the third write current, a fourth write current through the write head that is less than the threshold current required to create a magnetic field that exceeds a coercivity of the recording medium; and repeating the steps of providing the first, second, third and fourth write currents in a manner appropriate to encode a desired magnetic field pattern on the recording medium.