Abstract: An insert that is to be mounted on a hub of a spool positioned in a magnetic tape cartridge for permitting the spool to be attracted to the magnetic element of a computer drive mechanism includes a circular ferromagnetic disk having oppositely positioned first and second planar surfaces. The disk is provided with a centrally positioned through hole, and a plurality of securing through holes for permitting the ferromagnetic disk to be secured to the spool hub of a magnetic tape cartridge. The disk includes an annular flange that extends around the outer periphery of the disk and axially away from the first planar surface. The ferromagnetic disk has a thickness as measured between the first and second planar surfaces that is less than 1.35 mm. The disk can also include an annular flange that surrounds the centrally positioned hole and that extends axially away from the first planar surface.

Abstract: A tape guide for use in a magnetic tape cassette for guiding the magnetic tape includes a cylindrical member having a slit extending along its length. The slit defines first and second edge forces that face each other. In one embodiment, a plurality of tabs are connected to the first and second edge faces of the cylindrical member and extend towards the oppositely positioned edge face. The tabs overlap one another and serve to inhibit the tape guide from becoming interlocked with another tape guide. In another embodiment, a plurality of outdented portions extend from both edge faces and each outdented portion is positioned opposite to an indented portion on the opposite edge face.

Abstract: A shutter for covering the head window opening in a protective case that encases a flexible disk is manufactured from thinner and less expensive material and is made smaller in order to result in significant cost savings. The shutters are manufactured so as to form a band of connected shutters. The band of connected shutters is then wound to form a wound roll of shutters that are not susceptible to damage as a result of repeated contact with other shutters. Adjacent shutters can be connected to one another by strips of connecting material arranged in various manners.