Adjusting rotational speed based on ambient temperature in a HDD
AssigneeHGST Netherlands B.V.
InventorsTakao Suzuki, Kohji Takahashi, Tomoki Hiramatsu, Toshihisa Kiyonaga
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Abstract
A HDD including a temperature sensor for sensing ambient temperature in the HDD, a spindle motor comprising a fluid dynamic bearing; and a controller configured for adjusting a rotational speed of the spindle motor based on the measured ambient temperature while a rigidity of the fluid dynamic bearing is maintained, and reducing power consumption of the HDD based on the adjusting the rotational speed of the spindle motor.
Claims11
A hard disk drive (HDD) comprising:
- a temperature sensor for measuring ambient temperature in said HDD;
- a spindle motor comprising a fluid dynamic bearing;
- a controller configured for adjusting a rotational speed of said spindle motor based on said measured ambient temperature while a rigidity of said fluid dynamic bearing is maintained, and reducing power consumption of said HDD based on said adjusting said rotational speed of said spindle motor, wherein said controller is further configured for:
- adjusting said rotational speed to a first rotational speed based on said ambient temperature being greater than a first temperature;
- and
- adjusting said rotational speed to a second rotational speed based on said ambient temperature being less than or equal to the first temperature, wherein said first temperature is 45 degrees Celsius,
- wherein said first rotational speed is 4500 RPM, and wherein said second rotational speed is 4300 RPM;
- and
- memory for storing preset rotational speeds.
A method for adjusting rotational speed based on ambient temperature in a hard disk drive (HDD), said method comprising:
- measuring an ambient temperature in said HDD;
- storing preset rotational speeds in memory;
- adjusting a rotational speed of a spindle motor based on said measured ambient temperature, wherein adjusting said rotational speed further comprises:
- adjusting said rotational speed to a first rotational speed based on said ambient temperature being greater than a first temperature;
- adjusting said rotational speed to a second rotational speed based on said ambient temperature being greater than a second temperature and less than or equal to the first temperature;
- and
- adjusting said rotational speed to a third rotational speed based on said ambient temperature being less than or equal to the second temperature;
- adjusting said rotational speed to a second rotational speed based on said ambient temperature being less than or equal to a first temperature;
- maintaining rigidity of a fluid dynamic bearing at said adjusted rotational speed;
- and
- reducing power consumption of said HDD based on said adjusting said rotational speed of said spindle motor.
Dependencies are inferred from the claim text.