Patent ID: 7803471

Claim:
A magnetic tape comprising a nonmagnetic support, a magnetic layer which is formed on one surface of the nonmagnetic support, and a backcoat layer which comprises a binder and nonmagnetic powder containing carbon black as a component and which is formed on the other surface of the nonmagnetic support and has pits for optical servo formed thereon, said pits having been formed by irradiation with a laser beam and burnt residues formed by the irradiation of the laser beam having been removed from said pits, characterized in that a content of the nonmagnetic powder in the backcoat layer is from 50 wt. % to 60 wt. % based on the total weight of the nonmagnetic powder and the binder in the backcoat layer, that an average surface roughness Ra of the flat portion of the backcoat layer, measured with an atomic force microscope, is from 10 nm to 30 nm, that an average of the reflectance on a flat portion of the backcoat layer is from 8.5% to 14.9%, and that a maximum rate of fluctuation of the reflectance on the flat portion, depending on a position of the magnetic tape: [Maximum of absolute value of (Reflectance−Average reflectance)]×100/(Average reflectance) is from 2.8% to 10%.