Abstract: A substrate including a disk having a pair of opposed faces and being coined to provide a sub-micron flatness and smoothness for the disk faces. The coined disk can then be coated with a layer of storage material and used as a storage medium. Apparatus and a method for forming the coined substrate includes means for moving a plurality of disks along a predetermined path after the disks have been formed by blanking or stamping. The disks are cleaned before being coined and then stacked into containers which can be closed for transit to a point of use. The coining of the disks and the placement of the disks in containers is done under clean room conditions and the resulting coined substrates are free of flaws and defects encountered with the practice of conventional substrate forming techniques.

Abstract: A substrate including a disk having a pair of opposed faces and being coined to provide a sub-micron flatness and smoothness for the disk faces. The coined disk can then be coated with a layer of storage material and used as a storage medium. Apparatus and a method for forming the coined substrate includes means for moving a plurality of disks along a predetermined path after the disks have been formed by blanking or stamping. The disks are cleaned before being coined and then stacked into containers which can be closed for transit to a point of use. The coining of the disks and the placement of the disks in containers is done under clean room conditions and the resulting coined substrates are free of flaws and defects encountered with the practice of conventional substrate forming techniques.

Abstract: A method of manufacturing a substrate for a memory disk characterized in that a blank material comprising a non-magnetic metal substrate covered with a non-magnetic metal as an underlayer is subjected to a coining operation by two dies, i.e. upper and lower dies each having flat compressing surface and a certain kind of textured design formed thereon within an apparatus including a mandrel and a die ring arranged to limit the spreading extent of the material whereby a surface having ultra-preciseness and simultaneously impressed texture design is obtained.

Abstract: A method for manufacturing a metal substrate for a memory disk wherein a metal blank material (6) is sandwiched between two dies within a metal mould (3) limiting the extent to which the material spreads, using a core member (4) if necessary, each of the dies having a flat and smooth working surface, the compression force and sheet gauge reduction ratio being regulated or the surface roughness and amount of coating lubricants employed being regulated.

Abstract: A method of manufacturing a substrate for a memory disk characterized in that a blank material comprising a non-magnetic metal substrate covered with a non-magnetic metal as an underlayer is subjected to a coining operation by two dies having flat compressing surfaces within an apparatus including a mandrel and a die ring arranged to limit the spreading extent of the material whereby a surface having ultra-preciseness is obtained.

Abstract: A carrier for substrate and media disk members is disclosed having a base member with upstanding side and end walls and a top surface having a media supporting recess projecting downwardly and including a plurality of continuous semi-circular V-shaped grooves each subtending an angle of less than 180 degrees. Locating means are provided along one side of the carrier for locating the carrier with respect to disk handling equipment. The carrier is provided with a transparent lid having side and end walls respectively telescopically enclosing side and end walls of the base member. The base member has elongate indentations for engaging the top surface of the lid member on which the base member is stacked, and the lid member is provided with elongate upwardly projecting support ridges which contact the underside of the base member stacked thereon.

Abstract: A carrier for substrate and media disk members is disclosed having a base member with upstanding side and end walls and a top surface having a media supporting recess projecting downwardly and including a plurality of continuous semi-circular V-shaped grooves each subtending an angle of less than 180 degrees. Locating means are provided along one side of the carrier for locating the carrier with respect to disk handling equipment. The carrier is provided with a transparent lid having side and end walls respectively telescopically enclosing side and end walls of the base member. The base member has elongate indentations for engaging the top surface of the lid member on which the base member is stacked, and the lid member is provided with elongate upwardly projecting support ridges which contact the underside of the base member stacked thereon.