A fluid dynamic bearing motor is provided having relatively rotatable
facing surfaces that are reliably lubricated. A radial gap is defined
between the relatively rotatable facing surfaces, wherein a first axial
end of a fluid dynamic bearing has a larger radial gap as compared to a
central region of the fluid dynamic bearing. In an aspect, a fluid
recirculation passageway is established between the first axial end and
the central region of the fluid dynamic bearing. In an aspect, a fluid
reservoir is formed axially above the first axial end of the fluid
dynamic bearing. Robustness of the FDB motor is increased, and
sensitivity to external loads or mechanical shock events is reduced. Dry
surface-to-surface contact of bearing surfaces and reduced performance or
failure of the motor or disc drive components is averted. The use of
diamond-like coating on relatively rotatable fluid bearing surfaces may
also be reduced or eliminated.