Magnetic tape, magnetic tape cartridge, magnetic tape system, test method, and manufacturing method of magnetic tape

A manufacturing method of a magnetic tape including a plurality of servo bands, each having a plurality of servo patterns recorded along a first longitudinal direction, arranged in a width direction, the manufacturing method comprising:

• installing a servo write head that has an opposing surface, which is a surface opposing a recording surface of the magnetic tape in a case where the plurality of servo patterns are recorded along the first longitudinal direction, and a plurality of gap patterns, which are formed on the opposing surface at intervals along a second longitudinal direction and correspond to the plurality of servo patterns, in a posture in which the recording surface and the plurality of gap patterns oppose each other;
• and
• recording the plurality of servo patterns on the recording surface along the first longitudinal direction by using the servo write head installed in the posture, to form the plurality of servo bands on the recording surface,
• wherein an indicator indicating non-linearity of the servo pattern is within 15% or less of a track pitch,
• the track pitch is a pitch between a plurality of tracks formed by recording data on the magnetic tape by a recording element in accordance with a signal obtained from the plurality of servo patterns,
• the indicator indicates a degree of variation of a plurality of PES difference gaps from an average value of the plurality of PES difference gaps,
• the PES difference gap is a difference between a first PES difference and a second PES difference, the first PES difference being a difference in PES between a pair of first positions corresponding to each other in the width direction in a pair of servo patterns recorded at corresponding positions in the width direction between a pair of servo bands that span one or more of the servo bands in the width direction among the plurality of servo bands, the second PES difference being a difference in PES between a pair of second positions deviated from the pair of first positions in the width direction by a first predetermined interval in the pair of servo patterns,
• the plurality of PES difference gaps are obtained by measuring the PES difference gap in the pair of servo patterns for each second predetermined interval along the width direction, and
• the first predetermined interval is larger than the second predetermined interval.