An experimental investigation of the effect of medium thickness and flying height on the read back signal

An experimental investigation has been conducted into the dependence of the read signal on flying height and medium thickness, employing a technique that permits the study of the effect of flying height and medium thickness on the same disk using the same slider. For the range of flying height (50-250 μin) and medium thickness (0-70 μin) investigated, excellent agreement with theoretical predictions is seen to exist for the maximum signal amplitude and half-pulsewidth of isolated pulses. It is further seen that the 6-dB packing density, calculated from half-pulsewidth measurements of isolated pulses, agrees well with experimental results.