Patent ID: 6256158
Filing Date: 2001-07-03
Classification: G11B

Abstract:
A method of optimizing a write channel in a data storage device, said write channel comprising:a first current source operable to generate a first current signal of a first current amplitude;a second current source operable to generate a second current signal of a second amplitude;a delay device operable to produce a delay period between said first current signal and said second current signal; andmeans for adding said first and second current signals having a delay period therebetween to form a data write signal which is input to a write head having a frequency roll off characteristic,wherein in each of said first amplitude, said delay period and said second amplitude are variable, said method comprising the steps of:(i) varying one of said first amplitude, said delay period and said second amplitude through a plurality of values while maintaining the other ones of said first amplitude, said delay period and said second amplitude at fixed values;(ii) for each value of said plurality of values, determining a quality metric of a corresponding output of said write channel; and(iii) selecting a value of said plurality of values which produces a write channel output having an optimum quality metric.2.The method as claimed in claim 1, wherein each of said first amplitude, said delay period and said second amplitude are independently variable.