Abstract: A passive cycle skipping valve comprising a pawl and a wheel comprising a first plurality of pins, wherein a distal end of the pawl is configured to engage any of the first plurality of pins where when the second pin is separated from the first pin by at least a threshold pin separation distance, the valve opens and when the second pin is not separated from the first pin by at least the threshold pin separation distance, the valve does not open.

Abstract: A memory disk having a central opening and planar sides for receiving magnetic media on both of the sides is bounded by a cylindrical outside diameter peripheral edge and chamfered edges extending between each of the planar sides. The peripheral edge is clamped by a disk processing chuck including a disk retainer mount having a central disk support for mounting a circular disk edge bounding the central opening and a mount cylindrical beveled edge receiving an outside diameter chamfered edge of the disk. A ring in the retainer mount includes a multiplicity of spaced radial fingers extending cylindrically around the ring, each finger having a distal end extending to a first position outboard of the disk peripheral edge. The distal ends are moveable inwardly to a second position by an inflatable bladder acting simultaneously against all the fingers, placing the distal end tips into clamping contact with the disk peripheral edge mounted on the retainer mount.