Patent ID: 9111583
Filing Date: 2015-08-18
Classification: G11B

Abstract:
1. A data storage assembly connectable to a host system comprising: one or more data storage media comprising one or more rotating discs powered by a spindle motor utilizing power from a host system in normal operation; an auxiliary power source comprising back electromotive force (EMF) derived from momentum of the rotating discs via the spindle motor configured to supply power to store data to the one or more data storage media in event of a loss of power from the host system; and test circuitry configured to test a usable energy available from momentum associated with the one or more spinning discs to supply the power to store the data in the event of the loss of power from the host system by interrupting power to the storage device, writing data to the one or more storage media until usable energy derived from momentum of the rotating discs via the spindle motor is exhausted, and determining how much usable energy is available based on the amount of data written after interrupting power to the storage device.