Typical BB motors withstand up to 200 Gs of shock, while motors with hydrodynamic bearings can handle almost two times that amount. Bearing dampening is critical to a hard disk drive, enabling it to accurately write to or read from the disk. If there are imperfections in the roundness of the balls or in the raceways in which they roll, higher errors occur when the motor rotates. Because HDB motors have no bearings, NRRO is not as large a concern. Fatigue Life - Bearings typically fail because of metal fatigue caused by the constant rolling of the metal balls in the raceway.
Fatigue life is the calculated number of hours the motor can survive before metal fatigue occurs.
Summary Drives using this Hydrodynamic Bearing Technology have fewer track errors, enhanced acoustical performance, longer spindle life, and greater resistance to the effects of shock. These advantages make the Quantum Fireball AS an ideal drive to use when upgrading your system with a high-performance large capacity drive.