Patent ID: 8804269

Claim:
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.