Abstract: A support for a stretched recording film and method of attaching the film to the support. The support includes a flat disk-shaped base, an annular upstanding rim which terminates in a reference surface, an annular radially extending bonding lip which includes a bonding surface inclined with respect to the plane of the base, and a groove separating the reference surface and the bonding surface. The method of attaching the film to the support includes deflecting the center of the base to decrease the diameter of the bonding surface, bonding the film to the bonding surface, and ceasing to deflect the base so that the diameter of the bonding surface increases to induce tension in the film. A second protective layer of film may be simultaneously stretched over and bonded to the first layer of film.

Abstract: A support for a stretched recording film and method of attaching the film to the support. The support includes a flat disk-shaped base, an annular upstanding rim which terminates in a reference surface, an annular radially extending bonding lip which includes a bonding surface inclined with respect to the plane of the base, and a groove separating the reference surface and the bonding surface. The method of attaching the film to the support includes deflecting the center of the base to decrease the diameter of the bonding surface, bonding the film to the bonding surface, and ceasing to deflect the base so that the diameter of the bonding surface increases to induce tension in the film. A second protective layer of film may be simultaneously stretched over and bonded to the first layer of film.

Abstract: A protective cartridge and drive mechanism for use with a stretched surface recording (SSR) disk. The cartridge encloses the disk and includes a rotary locking mechanism which forces the disk into sealing engagement with the cartridge and an erasure preventative control lever which may be manually operated from outside the cartridge. The drive mechanism includes apparatus which releases the cartridge locking mechanism, a sensor which detects the position of the cartridge control lever and operates to prevent the erasure of material recorded on the disk, and two magnetic transducer heads diametrically spaced with respect to the disk which allow random access to recorded information and switching between information recorded at two locations on the disk without the introduction of interference or receiver screen blanking during switching.