This document discusses the Fluid Dynamic Bearing (FDB) motor feature of hard drives used in Apple products.
Hard drive manufacturers have used a ball bearing spindle motors for many years. However, an innovative motor design, called Fluid Dynamic Bearings (FDB), which is not based on ball bearings, eliminates metal to metal contact. This improves acoustics, reduces vibration, lengthens the drive's useful life, and increases its shock resistance. Hard drives used in certain Apple products take advantage of this motor feature.