A fluid dynamic bearing motor features a stationary assembly, a rotating
assembly supported on the stationary assembly, a fluid dynamic bearing
system in a gap between the stationary and rotating assemblies, a radial
capillary seal defined proximate a first end of the journal gap, and at
least one re-circulation hole extending from the radial capillary seal to
a second end of the journal gap. A single thrust shaft end bearing which
pressurizes the shaft end to create an axial thrust bearing and drive
bubbles in the fluid (where the fluid is a liquid) to the outer diameter
of the shaft and into the recirculation path. The journal may be
supported for rotation by dual sets of grooves; the dual groove asymmetry
in the journal maintains a positive pressure between the journals.