Abstract: A fuse circuit for sensing a fuse connected state and layout designing method thereof are disclosed. Embodiments include a fuse program control unit providing a fuse open voltage in response to a program signal, a fuse cell unit configured to use a contact resistor connecting a node supplied with the fuse open voltage and a node supplied with a fuse connection voltage as a fuse, the fuse cell unit outputting a state information of the contact resistor in response to the fuse open voltage, and a fuse sensing unit outputting a fuse data signal corresponding to the state information of the contact resistor in response to a read signal. Accordingly, embodiments reduce a layout size of the fuse circuit.

Abstract: An improved hard disk drive is capable of storing FAT information into a FAT memory. The number of operation processes of the HDD is reduced, so that access time of the HDD can be advantageously improved. The HDD includes a head for writing data on a hard disk and for reading data from the hard disk and a file allocation table memory for storing a file allocation table information. A controller controls the movement of the head, the rotation of the hard disk drive, and a writing and reading operation of the data.

Abstract: An automatic polarity conversion circuit for providing output signals having predetermined output polarities. The automatic polarity conversion circuit includes first and second input terminals for receiving first and second input signals, respectively. Also included is a converter converting the first and second input signals into first and second output signals having predetermined first and second output polarities, respectively, regardless of the polarities of the first and second input signals. Further, a first output terminal outputs the first output signal, and a second output terminal outputs the second output signal.