Abstract: Embodiments of the present invention may provide methods and systems for recycling asphalt shingles (1) perhaps in a chemical solution (2) to provide oil free recyclable fiberglass (6), oil free recyclable sand (7), and even recyclable oil (8). The present invention may provide a screened tubular rotating equipment (16) may be at least partially immersed (18) in a tank (17) of a chemical solution (2) to treat the asphalt shingles (1).

Abstract: The invention is directed to a head positioning servo system for disk drives employing a dedicated servo surface. A plurality of servo cells are recorded on the servo surface each including a sync field for storing multiple magnetic flux transitions. Each sync field consists of multiple unit areas wherein each of said transitions is selectively stored in one or more of said unit areas. In the preferred embodiment, each sync field includes double frequency (2f) transitions which are stored in a single unit area and single frequency (1f) transitions which are stored in two adjacent unit areas. The two types of transitions are used to encode each sync field to define either a valid ("1") sync or a nonvalid ("0") sync. Valid syncs are detected to generate sync pulses for timing control to derive both rotational and radial position information from the servo surface.

Abstract: A method and apparatus for originally recording servo information on a disk surface. The apparatus comprises a servo writer assembly which includes an optical encoder having a movable input member and means for producing an output signal which indicates small uniform units of movement of said input member. The servo writer assembly is detachably mounted to a disk storage system with the optical encoder input member tightly physically coupled to the head arm of the storage system head disk assembly. During servo writing, the optical encoder output signal is connected in a closed servo loop with the head positioner motor so that the positioner motor can then be operated to precisely radially increment the servo head, track by track, over the disk servo surface.