Abstract: A disk drive is disclosed comprising a head actuated over a disk having a plurality of data tracks. An ideal data tracks per inch (TPI) profile is determined for the disk, and an actual data TPI profile is generated that estimates the ideal data TPI profile by combining a first segment of a first predetermined data TPI profile and a second segment of a second predetermined data TPI profile.

Abstract: A disk drive is disclosed comprising control circuitry operable to calibrate a write current parameter. A write current is initialized to an initial write current INIT_Iw, and an overshoot is initialized to a maximum MAX_OS. The write current is swept from INIT_Iw to a maximum write current MAX_Iw while writing and reading data from a target track to measure a first quality metric. A second quality metric associated with wide track erasure is also measured. A quality of the write operations is determined in response to the first and second quality metrics. When the quality of the write operations does not exceed a threshold, at least one of the MAX_Iw and MAX_OS is decreased and the process is repeated. Otherwise, the write current is swept from a minimum write current limit MAX_Iw to the adjusted MAX_Iw for a plurality of tracks to find an optimal write current for each track.