Abstract: A portable data storage device mainly includes a universal serial bus (USB) connector; a volatile memory for reading, writing, and storing data; a control chip connected between the USB connector and the volatile memory for serving as a transmission interface with an external electronic apparatus; a charging battery for providing power needed by the volatile memory to store data; and a battery charging circuit connected between the USB connector and the charging battery for charging the charging battery, so that the portable data storage device has increased data processing speed and may be produced at lowered cost.

Abstract: A digital sound file playback reproducer includes a housing in which at least a connection port, a sound source output unit, and a processing unit are provided. The connection port is adapted to connect with an external recording medium having sound filed stored thereon. The processing unit picks up and processes the sound files in the externally connected recording medium, and sends the processed sound files to the sound source output unit. Since the digital sound file playback reproducer does not include an internal memory, a consumer of existing recording media, such as memory cards and USB flash disks, could buy it without wasting money in repeated memory.

Abstract: A method of on-line adjusting a sled motor control signal (FMO) is disclosed. First, a predetermined FMO is assigned to move a sled for seeking, and a photo signal is monitored. The number of waveforms appearing in the photo signal and a distance from an optical pickup to a target track are calculated under this predetermined FMO. Then, the optical pickup is moved to the target track such that the optical pickup after seeking is located at a center position of a movable range. If the number of waveforms appearing in the photo signal is not equal to a predetermined number, the duration of the FMO is adjusted according to the difference therebetween.

Abstract: A portable data storage device allowing dynamic setting of disk type thereof includes a flash memory that includes at least two segments preset as a CD-ROM segment and a fixed type hard drive segment. When the portable data storage device is plugged in a processing unit of an electronic apparatus, one of the two segments having a non-applicable disk type is hidden depending on an operating system under which the processing unit operates, so that the processing unit may detect only another one of the two segments that has an applicable disk type. A method for dynamically setting an applicable disk type of the portable data storage device is also provided.

Abstract: A method of controlling a sled motor control signal (FMO) is disclosed. First, a predetermined FMO is assigned to move a sled, and a photo signal is monitored. The FMO is off after a predetermined number of waveforms have appeared in the photo signal. Then, a position of an optical pickup is finely adjusted such that the optical pickup is at a center position of a movable range after the seeking operation.

Abstract: A method for correcting a position of an optical pickup before track following is disclosed. The actual position of the optical pickup before seeking is detected. Then, a sled motor control signal is provided to compensate for the force of the sled seeking such that the optical pickup is at a center of a movable range after seeking.

Abstract: A method for arranging conducting lines of a flexible cable in an optical disk drive first confirms the pins having similar functions of all chips on a main board and a sub-board, and uses only one conducting line of the flexible cable to connect these pins. Therefore, the number of the conducting lines of the flexible cable can be reduced.

Abstract: A portable data storage device is characterized in having an internal file and a start program separately pre-recorded in predetermined segments on a flash memory of the device, an encryption mechanism for protecting the device against arbitrary access, and auto-execution ability like a compact disk. With these arrangements, it is ensured the start program is automatically executed without any user operation to play the internal file each time the portable data storage device is used. And, the internal file is effectively protected from deletion, unauthorized copy, or theft.

Abstract: A lateral engagement structure for an electrical connector capable of engaging with a lateral side of a circuit board includes a main body and an elastic arm. The body includes vertical and horizontal plates, wherein a first stopper block is set at a middle of a front end of the vertical plate, and a space is formed below the first stopper block. The arm has a rear end connected to the body, a free front end, and a front section having an actuator and an engagement portion engaged with the board. The arm's front end is bent toward the first stopper block to form a first transversal plate. When the arm is elastically moved toward the vertical plate, the first transversal plate is stopped at the first stopper block, and the engagement portion still engages with the board. When the first transversal plate passes through the space, the engagement portion is caused to separate from the board.

Abstract: A method of disc protection during servo focusing is disclosed. First, the disc device performs a servo focusing on a disc at a first speed, and records the first focusing time accordingly. Afterward, the disc device calculates a second focusing time required for another servo focusing if the disc requires re-focusing, and re-focuses the disc if the second focusing time exceeds the first focusing time.

Abstract: A method for detecting an unbalanced optical disc in an optical disc drive. The unbalanced optical disc is detected by a pick-up head of the optical disc drive to obtain a tracking error signal. A first track-across number at which the pick-up head travels on the unbalanced optical disc is determined when the unbalanced optical disc rotates at a first rotational speed. A second track-across number at which the pick-up head travels on the unbalanced optical disc is determined when the unbalanced optical disc rotates at a second rotational speed. The first track-across number and second track-across number are computed to obtain a resulting value. The unbalanced level of the unbalanced optical disc is determined according to the resulting value.

Abstract: A method of braking control in rapid track seeking for an optical drive. The optical drive has a pickup head for reading information from an optical disc therein. According to the method, a tracking error signal is obtained in the rapid track seeking motion of the pickup head. A seeking velocity is obtained by calculation according to the tracking error signal. Since the seeking velocity varies, a braking force is determined according to the seeking velocity for braking the pickup head.

Abstract: A method for processing error control for a seeking servo of an optical disk drive includes calculating a “track on” time when control of a pickup head is switched from a seeking servo system to a tracking servo system to start a “track on” process, moving the pickup head to the center of a movable range when the “rack on” process is not completed in a predetermined time, and switching control of the pickup head to the tracking servo system to start another “track on” process.

Abstract: A substrate structure of Flip Chip package includes a plurality of patterned circuit layers alternately stacking up with at least an insulative layer for isolating the patterned circuit layers. The patterned circuit layers are electrically connected each other wherein one of the patterned circuit layers is positioned on the surface of the substrate. The patterned circuit layer includes a plurality of first mounting pads and a plurality of second mounting pads. The solder mask layer covers the patterned circuit layer on the surface of the substrate, and a portion of the surface of the outer edge of the mounting pads while exposes a portion of the surface of the first mounting pads and the whole surface of the second mounting pads.

Abstract: A method for preventing contact between a pickup head and an optical disc. First, a voltage is provided to the pickup head, thereby repositioning the pickup head closer to the optical disc from an initial position to a biased position. A track-seeking motion is executed to move the pickup head to a predetermined information track. The pickup head starts a vibration in the direction away from the disc when a focus error occurs during the track-seeking motion.

Abstract: A method of accelerating a track-following process for an optical drive. The optical drive has a motor and a pickup head for reading information from an optical disc therein. According to the method, an input signal with a first frequency and a first phase is received by detecting the rotation speed of the motor and a radius of the information track where the pickup head locates on the optical disc. When either frequency or phase of a data phase locked loop (DPLL) frequency signal of the optical drive is different from the first frequency and the first phase, the DPLL frequency signal is adjusted to the first frequency and the first phase. With the adjusted DPLL frequency signal, data from the optical disc is read correctly.

Abstract: A method of fabricating a FCBGA (Flip-Chip Ball-Grid-Array) package without causing mold flash is proposed, which is characterized by the forming of a dummy pad over the back surface of the substrate to allow the portion of the solder mask formed over a vent hole in the substrate to be substantially raised to an elevated flat surface where a groove is then formed to surround the exit of the vent hole. During a molding process, when the encapsulation material infiltrates to the exit of the vent hole, it can be confined within the groove in the elevated flat surface over the dummy pad, thereby preventing it from flashing to nearby solder-ball pads.

Abstract: A DVD recognition method and apparatus is disclosed. First, a disc recognition apparatus uses a laser with a specific wavelength to irradiate an inner area of the DVD, thereby obtaining an inner TE signal. Then, the disc recognition apparatus uses the laser to irradiate an outer area of the DVD, thereby obtaining an outer TE signal. Afterward, the type of the DVD is recognized according to the inner and outer TE signals.

Abstract: The present invention discloses a method for determining disc type. Perform a focus servo process by emitting a light beam with a specific wavelength and a focus error signal is generated. According to the overshooting value after the focus error signal forming an S curve, the disc type is determined.

Abstract: A method for correcting disc type determination is disclosed. The method detects a tracking error signal, and verifies accuracy of a disc type determination according thereto.