Abstract: A cleaning cartridge for a magnetic disk drive has a flexible cleaning pad on a wiper assembly which is rotatable in the base of the cartridge. A knob on the outside edge of the cartridge is moved back and forth to rotate the wiper assembly by a cable attached to the hub. As the assembly rotates, a cam surface forces the flexible pad into engagement with the head to clean it.

Abstract: Ferrite read and write modules of a magnetic head assembly that are aligned and positioned within a nonferrite housing are clamped by a leaf spring between the walls of the housing. The leaf spring compensates for thermal mismatch between the ferrite modules and the housing, and compensates for stress fluctuation that occurs with temperature change. The clamping force of the leaf spring is precisely controlled.

Abstract: Method and apparatus for opening stacked disk memory members arranged in a pack for co-rotation and having substantial freedom of axial movement relative to one another, the opening being accomplished by engaging the disk pack with drive means having axially extending pins of varying length, and of a predetermined pattern with the increments of pin length variation being substantially equal to the desired openings between the disk members, and the disk memory members having openings defined therein with corresponding patterns adjacent disk memory members having progressively fewer openings to receive pins of a predetermined pattern with the result that all pins of a predetermined length bear upon a disk memory member and axially separate it from the adjacent disk memory member, thereby providing an opening at the termini of each set of pins of common length.

Abstract: An object of the invention is to provide a flexible disc having a frusto-conical recording surface. The disc is bistable allowing access to both sides, and is well suited for data storage in computer and data processing systems. It may be used either singularly or collectively in disc packs.