Compact head and disk assembly

A self-contained, plug-in micro-Winchester compact head and disk assembly (HDA) module for use with external disk drive control electronics, the plug-in HDA module including plural internal electromechanical means including disk rotation means for rotating a plurality of disks, at least one of which is a data storage disk having a storage capacity in excess of ten megabytes of data, at a predetermined, substantially constant angular velocity and mass balanced, direct drive rotary voice coil electromechanical actuator head positioning means for positioning a plurality of commonly mounted, moveable data transducer means at selected ones of a plurality of concentric track locations on the data storage disk so that data may be written to and read from a track location by a selected one of the data transducer means, the HDA module further comprising a generally rectangular box housing having an overall maximum height not greater than 24.5 millimeters as measured perpendicularly to parallel planes in which said disks lie, the HDA module defining an enclosed interior chamber for providing support structure for mounting and containing said plural electromechanical means and said data transducer means, said HDA module including electrical connection means extending therefrom and adapted for plug-in connection of said data transducer means and said electromechanical means to said disk drive control electronics.