Magnetic tape device and head tracking servo method

A head tracking servo method comprising:

• reading a servo pattern of a magnetic layer of a magnetic tape by a servo head in a magnetic tape device,
• wherein a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec,
• the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading element,
• the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support,
• the magnetic layer includes the servo pattern, and
• a coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.30.