A robust spindle motor is provided having added shock resistance for fluid
containment. In an aspect, a high-speed centrifugal capillary seal
contains a fluid reservoir extending between similarly rotatable
components. Fluid is recirculated through the motor and substantially
around a counterplate. Proper axial positioning of motor components and
stiffness is maintained in motors supporting heavy loads such as a disk
drive memory system having a weighty disc pack. In an aspect, two
separate thrust surfaces provide oppositely directed axial forces acting
on motor components. In an aspect, a single thrust plate that is
comparatively small is utilized, reducing power consumption. Also, a
thrust bearing situated inboard of a capillary seal forms a comparatively
small diameter thrust plate gap. The comparatively small diameter thrust
plate gap increases efficiency and characteristics including surface
flatness, run out and perpendicularity are improved.