Patent ID: 8760792

Claim:
A method of determining an extent of thermally-induced media expansion of a storage device, comprising: writing a first signal on a predetermined center track; writing a second signal on a predetermined number of inner diameter (ID) sideband tracks immediately adjacent to the center track and writing the second signal on a predetermined number of outer diameter (OD) sideband tracks immediately adjacent to the center track; calculating a jog offset range based on the predetermined number of ID sideband tracks and the predetermined number of OD tracks; over the calculated jog offset range, reading the second signal at a first temperature, and determining a jog value for each of the predetermined number of ID and OD sideband tracks from a quantity related to a magnitude of the read second signal at the first temperature; over the calculated jog offset range, reading the second signal at a second temperature that is warmer than the first temperature, and determining a jog value for each of the predetermined number of ID and OD sideband tracks from a quantity related to a magnitude of the read second signal at the second temperature; and computing a jog delta between the determined jog values at the first and second temperatures for each of the predetermined number of ID and OD sideband tracks, a value of each of the computed jog deltas being indicative of the extent to which thermally-induced media expansion affects a position of each of the predetermined number of ID and OD sideband tracks relative to the predetermined center track.