Peripheral device of a portable computer with thermal control circuitry

A hard disc drive installed inside a housing of a portable computer, the portable computer comprising a main memory for storing programs and data, a central processing unit for executing programs stored in the main memory, and a bus for connecting the peripheral device and the central processing unit, the hard disc drive comprising:

• a housing for protecting elements inside the hard disc drive;
• a disc module installed inside the housing and having a hard disc set for storing data, a read/write head for writing data into the hard disc set or retrieving data from the hard disc set, and a motor for driving the hard dime set;
• data process circuitry installed inside the housing and electrically connected to the read/write head of the disc module and the bus for processing data stored in the disc module or data retrieved from the disc module;
• a microprocessor installed inside the housing for controlling operations of the hard disc drive;
• pulse circuitry installed inside the housing and electrically connected to the the data process circuitry and the microprocessor for controlling the speed of the data process circuitry and the speed of the microprocessor;
• and
• temperature controlled circuitry installed inside the housing having a temperature sensor;
• wherein when a temperature detected by the temperature sensor exceeds a first predetermined level, the temperature controlled circuitry will generate a first request to the pulse circuitry to reduce a frequency of pulses generated by the pulse circuitry from a first frequency to a second frequency so as to reduce a speed of the data process circuitry and the speed of the microprocessor from a first speed to a second speed.