lower side 86 of the printed circuit board 82. Components of greater height, which if located on the lower side
86 of the printed circuit board 82 would add to the overall height dimension of the disk drive apparatus 20, are located on the upper side 84 of the printed circuit board 82 so as to occupy the volumes between the upper side 84 of the printed circuit
board 82 and the third level of the base plate 38. While components having heights less than the specified value can be located on the lower side 86 of the printed circuit board 82, several of these components are located on the upper side 84 of the
printed circuit board 82 so as to occupy the volumes between the upper side 84 ofhard disk 124 in place against the shoulder 132 of the outer shell 130. Preferably, the clamp ring 134 is threaded to operatively engage a threaded surface on the upper, circumferential edge of the outer shell 130. The rotor
assembly 126 also includes a rotor shaft 136 that is integral with the outer shell 130 and fits within a central opening 138 defined by the base member 116. First and second bearing/race assemblies 140a, 140b, are located intermediate the rotor shaft
136 and the portion of the base member 116 defining the central opening 138 to allow the rotor assembly 126 to rotate relative to the base member 116 as well as provide support. The rotor assembly 126 further includes twelve magnets 142a-1, each of
which has a north pole face