Abstract: A liner for diskettes comprised of a nonwoven material which is thermally bonded in a closed cell pattern and which contains a binder material in amounts no greater than 1% by weight of fibers. This diskette liner shows debris reduction while not showing significant increase in flexural rigidity.

Abstract: A disk cartridge including a rotatable disk, a cartridge case for housing the disk, and a U-shaped shutter slidably disposed on the front edge of the cartridge case is disclosed. The cartridge case includes upper and lower walls, and a head access opening formed in both walls between a central axis and the front edge to access the disk. The access opening is opened and closed by the shutter which is biased closed. An indented portion is formed on the walls for receiving the shutter. The arm portion of each edge at the side toward which the shutter is biased serves as a stop for the shutter when the shutter is biased in the closed position. The front edge forming a border of at least one indented portion and adjacent the stop is recessed to provide a second stop. The shutter includes a wall portion adjacent the base of the U and adjacent the arm of the U mounted on the wall of the cartridge having the second stop. This wall portion abuts the second stop when the shutter is closed.

Abstract: A disk cartridge including a rotatable disk, a cartridge case for housing the disk having upper and lower shells, and a cleaning wiper disposed between each surface of the disk and the respective upper and lower shells is disclosed. A lifter is mounted on the lower shell for biasing the wipers into contact with the disk. Ribs are mounted on the upper shell opposite the lifter. The ribs are substantially parallel to the disk radius and substantially perpendicular to the direction of rotation of the disk and extend for substantially the entire radius of the disk. The ribs maintain a minimum level of wiping pressure on the disk along the entire radius of the disk. 3:1.9.