Abstract: A data storage device is disclosed comprising a head actuated over a disk comprising a plurality of data tracks, wherein the head comprises a write element radially offset from a read element by a writer/reader offset that varies relative to a radial location of the head over the disk. A first radial band (RB) of the data tracks is written from an outer diameter (OD) of the disk toward an inner diameter (ID) of the disk, and a first jog profile is calibrated for the first radial band that compensates for the writer/reader offset. A second RB is written from an ID to an OD, and a second jog profile is calibrated for the second RB that compensates for the writer/reader offset. The first RB is accessed using the first jog profile, and the second RB is accessed using the second jog profile.

Abstract: A disk drive is disclosed comprising a plurality of disk surfaces, and a head actuated over each disk surface. An off-track read capability (OTRC) is measured for each disk surface, and a radial density of data tracks for each disk surface is selected in response to the OTRCs. A linear density of at least two disk surfaces is adjusted to balance the OTRCs across the disk surfaces.

Abstract: A disk drive is disclosed comprising a disk, a head actuated over the disk, and a read channel for processing a read signal generated by the head. The disk drive further comprises a plurality of code segments including a read channel interface procedure having an input parameter comprising a pointer to a data structure. The data structure comprises a command ID identifying one of a plurality of routines, input data for use by the routine identified by the command ID, a pointer to a data structure for use by the routine identified by the command ID, and output data returned by the routine identified by the command ID.