Abstract: A method of adjusting the write speed of a CD drive includes writing data from a CD drive to a disk at a first speed during a first preset time. If, at the end of the first preset time, the data error rate at the first speed is larger than the error allowance upper limit for the first preset time, then writing of the data will be completed at the first speed. However, if at the end of the first preset time, the data error rate at the first speed is smaller than the error allowance upper limit for the first preset time, then the writing speed will be adjusted to a second higher speed. The same process can be repeated for the second higher speed.

Abstract: A method for reducing the number of operations performed on a recording disk during Mt. Rainier defect processing is disclosed. According to this method, data is written from a host to a recording disk. If there are defects in the section where data is to be written, a replacement block for the currently-processed defective block is searched for. If there is previous replaced data currently stored in the replacement packet buffer (RPB), and if the packet in the RPB is the same as the packet for the replacement block, then the method only copies the data in the currently-processed defective block into the corresponding replacement block in the RPB without any reading operations. In addition, after completion of the read and copy operations, no immediate write to the recording disk is performed, thereby saving time.

Abstract: A disk drive includes a disk tray disposed within a casing for receiving an optical disk thereon, a clamp-holding seat disposed above the disk tray and having a clamp opening, a clamp disposed within the clamp opening in the clamp-holding seat and projecting downwardly from the bottom side thereof, a protrusion structure disposed on the clamp-holding seat, a resilient structure disposed on the clamp-holding seat opening opposite to the protrusion structure, and a spindle motor disposed below the disk tray for rotating the disk once the spindle motor is moved upward via the reading opening to a reading position, where the disk is sandwiched between the clamp and the spindle motor.

Abstract: A method for reducing the stable rotation speed of an automatic ball balancing system is used with an automatic ball balancing system that has a rotor that has an annular track, with at least one ball provided for rotation inside the track. First, an optimum rotation speed ws that is between the unstable critical rotation speed wc of a ball and a working rotation speed w is first determined. In the next step, the rotor is accelerated to the optimum rotation speed ws. Next, the acceleration of the rotor is reduced until the balls are stationary relative to the track, and then the rotor is accelerated to the working rotation speed w.

Abstract: An optical disk player has a carrier having an accomodation space provided along a side edge thereof, and a modular deceleration device that is coupled to the accomodation space. The deceleration device has a module case body that is formed in one piece, and a plurality of gears, all of which are attached to the module case body.

Abstract: A disk reading device operates in both a suction mode and a cover-lifting mode. The device has a lower cover having a wall with an elongated opening provided in the wall, an upper cover that is connected for pivoting movement with respect to the lower cover, and a disk receiving space between the lower and upper covers. The disk receiving space is accessible via the elongated opening in a suction mode and by opening the upper cover with respect to the lower cover in a cover-lifting mode. A disk is drawn via the elongated opening into the disk receiving space, or a disk can be manually placed in the disk receiving space by opening the upper cover with respect to the lower cover. The device also includes a switch that switches operation of the disk reading device from the suction mode to the cover-lifting mode.

Abstract: A method is provided for determining whether a rotating disk in an optical disk reading device is unbalanced. According to the method, the disk is first rotated at a preset rotational speed, and a lens is then located to a first position. Then, as the lens is moved towards a second position at a predetermined speed, a time duration during which a preliminary signal is generated is determined. The disk is determined to be unbalanced if the time duration exceeds a preset value.

Abstract: An optical disk reading device has a substrate below which a CD is loaded, a base element fixed to an opening of the substrate, a movable element, a rotation part that movably connects the movable element to the base element in a manner such that the movable element moves rotationally and vertically with respect to the base element, and a clamp coupled to the movable element and extending through the opening of the substrate when the movable element moves with respect to the base element.

Abstract: A disk reading device has a housing having a disk receiving space provided therein, a first rod having a first guide pin, a second rod pivotably coupled to the first rod at a pivot point in a manner such that the first and second rods achieve a scissoring movement about the pivot point, with the second rod having a second guide pin. The device also includes a locking mechanism for locking the first and second rods at a fixed position, and a detection mechanism coupled to the first rod for detecting the size of a disk that is being inserted into the disk receiving space. The locking mechanism unlocks the first and second rods when a disk having a first size contacts the detection mechanism, and the locking mechanism maintains its lock on the first and second rods when a disk having a second size smaller than the first size is inserted into the disk receiving space.

Abstract: A spindle motor structure includes a rotor, a stator accommodated mainly inside the rotor, and an internal roof magnet located on an inner roof surface of a rotor bell of the rotor. The internal roof magnet further has an inner rim and an outer rim. The inner rim is located projection-wisely within a range of a hollow shaft of the stator. The outer rim is located projection-wisely between an internal peripheral surface of the rotor bell and an inner edge of a coil of the stator. By providing the internal roof magnet inside the rotor bell, a magnetic field to immerse the stator can be generated to damp out possible operational noises and disturbance upon the spindle motor.

Abstract: A locking mechanism for a disk reading device has a body, and an absorber provided on the body for absorbing impact energy. The absorber can be implemented in the form of an elastic material on the body of the locking mechanism, or by providing one or more hollowed regions on the body of the locking mechanism, or by providing resilient members that function to further absorb the impact energy.

Abstract: A method for controlling the rotational speed of a disk player includes first calculating the proportion of time which the disk player is reading data from the disk during a unit time T. Thereafter, the method increases the rotational speed of the disk player if the proportion of time that the disk player spends reading data from the disk is greater than a first threshold during each of m consecutive units of time T, and decreases the rotational speed of the disk player if the proportion of time that the disk player spends reading data from the disk is less than a second threshold during each of n consecutive units of time T.

Abstract: A disk drive has a tray with a chassis secured to the tray, the tray and the chassis being housed inside a housing. The disk drive includes a slide mechanism that is positioned between the chassis and the tray, and which is movable independently from the chassis. The disk drive also includes a locking and ejection mechanism that includes a first part that is secured to the chassis and a second part that is secured to the slide mechanism. The tray is locked inside the housing when the first part and second part engage each other, and the tray is ejected from the housing when engagement between the first part and second part is released.

Abstract: A method of minimizing the occurrence of buffer under run includes calculating the transmission speed of data from a host to a disk drive, adjusting the writing speed of the disk drive to a disk based on the transmission speed, and writing the data from the disk drive to the disk at the adjusted writing speed.

Abstract: The speed of a CD drive that is coupled to a host can be adjusted by the steps of receiving a command from the host, calculating the processing speed required by the host for executing the received command, and adjusting the processing speed of the CD drive if the required processing speed of the host is either greater than or less than the current processing speed of the CD drive.

Abstract: A guide rail assembly for use with a disk drive has a first rail that has a raised ridge with a wavy upper edge and a wavy lower edge. The assembly also has a second rail having a channel defined therein, with the channel having a wavy upper wall and a wavy lower wall. The raised ridge of the first rail is positioned for reciprocating movement inside the channel of the second rail.

Abstract: A method of VCODAC adjustment of speed is disclosed. Values of a VCO digital/analog converter (VCODAC) generator according to the frequency of every speed are estimated at first, and then an output of a loop filter is used to on-line adjust the value to an optimum value. As the pick up head reads the same position, it need not be adjusted again. The reading ability of an optical disk drive is improved.