Magnetic Disk Storage With Electro-Pneumatic Head Positioning
Original Publication Date: 1985-Jun-01
Included in the Prior Art Database: 2005-Feb-18
The data in a magnetic disk storage are accessed by one or several read/write heads fixed to an arm driven by a linear motor or a transducer for positioning the head on the selected track above the rotating magnetic disk. In up-to-date disk storages, the track access time is about 20 msec. For that purpose, the head must have a speed of up to 2 msec at an acceleration of up to 20 g. To permit such an acceleration, stable arms and powerful motors are required. In addition, the high rapidly moving mass necessitates stable and thus heavy-weight holding means. These requirements have to be met to permit moving heads with a mass of less than 100 mg. The principle of the head positioning described in this article is to drastically reduce the moving mass by positioning the head drive close to the head or between the magnetic disks.