Patent ID: 8009381

Claim:
A method for manufacturing a hard-disk drive, comprising: an operation of writing servo tracks by performing self-servo writing, said operation of writing servo tracks comprising: a first operation comprising: producing a first control equation for obtaining a servo pattern overlap amount that is used as a control target value during actual servo track writing, from a written servo track pitch, a servo pattern overlap amount that is a control target value at a time of writing, and a magnetic-recording-head characteristic value, arranging a root-mean-square error (RMSE) into series, and converting said RMSE into a probability distribution; a second operation comprising calculating a second control target value of a second written servo track pitch that results in an increased product yield, from said first written servo track pitch, product defect information, and said RMSE probability distribution; a third operation comprising producing a second control equation for obtaining a calculated servo pattern overlap amount for said magnetic-recording-head characteristic value, said calculated servo pattern overlap amount being a calculated control target value for writing a servo track with a calculated servo track pitch, by assigning said second control target value of said second servo track pitch into said first control equation; a fourth operation comprising calculating said calculated control target value of said calculated servo pattern overlap amount using said second control equation and said magnetic-recording-head characteristic value; and an operation of writing servo tracks into said hard-disk drive using said calculated control target value of said calculated servo pattern overlap amount.