Patent ID: 8824082

Claim:
A hard disk drive (HDD), comprising: a platter unit comprising a plurality of platters to store data; a spindle motor unit connected to the platter unit, to drive the platters of the platter unit to rotate; a head unit connected to the platter unit, to write data into the platter unit and read data from the platter unit; a cache unit to cache data; an interface connected to external power supplies; a switch unit; a control unit connected to the platter unit, the spindle motor unit, the head unit, the cache unit, the interface, and the switch unit, wherein the control unit controls the cache unit to cooperate with the head unit, the platter unit, and the spindle motor unit, to achieve reading and writing functions of the HDD, and detects operation states of the cache unit, the head unit, the platter unit, and the spindle motor unit; and a power supply unit connected to the interface through the switch unit, and connected to the platter unit, the spindle motor unit, the head unit, the cache unit, and the control unit, wherein the power supply unit converts the voltages of the external power supplies received from the interface into operation voltages of the control unit, the cache unit, the head unit, the platter unit, and the spindle motor unit, and supplies the operation voltages to the control unit, the cache unit, the head unit, the platter unit, and the spindle motor unit, in response to the switch unit being turned on; wherein the control unit outputs a control signal to turn off the switch unit, in response to the control unit detecting that at least one of the cache unit, the head unit, the platter unit, and the spindle motor unit is damaged; wherein the control unit outputs the control signal to turn off the switch unit, in response to the control unit being damaged; and wherein the voltages of the external power supplies cannot be transmitted to the power supply unit in response to the switch unit being turned off.