Embodiments in accordance with the present invention allow a magnetic disk drive to achieve noise reduction and low power consumption through rotation at a low speed and a high transfer rate through rotation at a high speed while allowing reliability to be maintained and achieving an improved recording density. The detuner includes a planar body mounted to the flywheel and having a central hub, a peripheral rim and a plurality of elastically deformable members connecting the hub to the rim. Then, the time of the most recent backup of the principal database is compared to the time of the most recent backup of the mirror database to determine if the principal database was backed up most recently. The software is structured to interact with the electronic signals and to cause the electronic system to produce the oral communication.