Patent ID: 8760783

Claim:
A method for obtaining a magneto-resistive head asymmetry (MRA) value for a hard disk drive, comprising: obtaining a plurality of analog-to-digital convertor (ADC) counts over a range of ADC sample values utilizing an injected MRA value, the range of ADC sample values including a negative portion and a positive portion; determining a negative peak value, the negative peak value corresponding to an ADC count value at a peak of the negative portion; determining a positive peak value, the positive peak value corresponding to an ADC count value at a peak of the positive portion; and computing, via a computing device, an estimated MRA value based upon the negative peak value and the positive peak value: according to equation (1): M ⁢ ⁢ R ⁢ ⁢ A = ( N - 32 - N 31 ) ( N - 32 + N 31 ) × 100 ⁢ % ( 1 ) wherein MRA is the estimated MRA value, N −32 is the negative peak value and N 31 is the positive peak value.