Samsung Electronics Co., Ltd.

Jin-Seak Kim

Jun-Ho Jang

Hyung-Joon Cho

Sung-Chul Hur

Min-Pyo Hong

No-Yeol Park

Seong-Hwan Yu

A hard disk drive which includes a voice coil motor driving portion which supplies drive current to a voice coil motor, and a controller which compares a supply voltage supplied to predetermined chips installed on a printed circuit board with a parking reference voltage previously set to a voltage higher than a power-on-reset voltage and controls the voice coil motor driving portion to apply current to a voice coil of the voice coil motor through the voice coil motor driving portion to park a magnetic head in a predetermined parking zone, when the supply voltage is lower than the parking reference voltage.

Hard disk drive, method for parking magnetic head of hard disk drive, and computer readable recording medium recording the method

An intelligent hard disk drive (HDD) is provided with a track pitch adjustment, which includes a detector for detecting a position difference between a present track position and a target track position during a track search mode to update the track position at every servo interrupt, and an adjuster for adjusting a displacement of a head according to a track of each of a number of zones demarcated on the disk during a track following mode to keep the head on-track.

Intelligent hard disk drive with track pitch adjustment

A speaking fire alarm system for not only giving an alarm in voice on an occurrence of a fire but also providing some information necessary for coping with the situations. The system includes a temperature sensor for sensing a surrounding temperature and providing a voltage responsive to the temperature sensed, comparator means for comparing the voltage supplied from the temperature sensor with a reference voltage and thereby providing a logic signal in accordance with its comparison, a central processing unit for receiving the logic signal from the buffer, thereby deciding the occurrence of the fire and providing both a fire alarm signal and message data according to an emergent situation, a voice synthesizer for providing address signals in accordance with the message data supplied from the central processing unit and also providing quantized voice messages which are synthesized from voice data received, voice memory for providing again to the voice synthesizer the voice data which is in advance stored in adequate format responsive to the address signals supplied from the voice synthesizer, voice output amplifying means for receiving the quantized voice messages supplied from the voice synthesizer for reshaping to smooth waveforms and amplifying to an adequate level, a host computer having a control program for controlling a plurality of slave fire control systems which are coupled to the host computer itself for detecting the fire alarm signal from each central processing unit and providing the fire alarm signal to remaining slave fire alarm systems.

Growing community of inventors

Suwon-si, South Korea

Jin-Seak Kim