Abstract: A magnetic disk reinforcement member in which in adhesive layer is spaced from the peripheral edges of the reinforcement member to preclude exuding of the adhesive beyond the peripheral edges as a result of forces applied to the reinforcement member and the adhesive layer during use of the magnetic disk. Also disclosed is a blank for completing the reinforcement member subsequent to assembling the reinforcement member with the magnetic disk to assure concentricity between the opening in the reinforcement member and the central aperture of the magnetic disk.