Abstract: A motor cooling system, a motor stator and a disc motor. The motor cooling system comprises an insulated cooling pipeline (2); the insulated cooling pipeline is mounted on a stator housing, the top surface of the insulated cooling pipeline is lower than or flush with the top surface of a stator iron core, and the bottom surface of the insulated cooling pipeline touches a coil of the motor stator for use in cooling the coil; the top surface of the stator iron core is configured to being arranged relative to a rotor, so that a magnetic field generated by the coil can interact with a rotor permanent magnet. Since the outer bottom surface of the insulated cooling pipeline touches the coil of the motor stator, a liquid coolant in the insulated cooling pipeline can cool the coil by means of heat conduction.

Abstract: A flash memory includes a plurality of blocks. A controller encrypts a first file to produce a first encrypted file and stores the first encrypted file to the flash memory, wherein the controller further comprises a key generation module, an encryption/decryption module and a key eliminating module. The key generation module produces a first key according to a first write command of a host device, wherein the first key is stored in a first block of the blocks. The encryption/decryption module encrypts the first file according to the first key to produce a first encrypted file, wherein the first encrypted file is stored in at least one second block of the blocks. The key eliminating module deletes the first key stored in the first block according to a first eliminating command in order to invalidate the first encrypted file stored in the second block.

Abstract: A flash memory includes a plurality of blocks. A controller encrypts a first file to produce a first encrypted file and stores the first encrypted file to the flash memory, wherein the controller further comprises a key generation module, an encryption/decryption module and a key eliminating module. The key generation module produces a first key according to a first write command of a host device, wherein the first key is stored in a first block of the blocks. The encryption/decryption module encrypts the first file according to the first key to produce a first encrypted file, wherein the first encrypted file is stored in at least one second block of the blocks. The key eliminating module deletes the first key stored in the first block according to a first eliminating command in order to invalidate the first encrypted file stored in the second block.

Abstract: An optical information reproducing apparatus includes: an irradiation section irradiating a light beam onto an optical information recording medium, in which holes are formed along a virtual track on a recording medium, along the virtual track; a light receiving section receiving a reflected light beam when the light beam is reflected by the optical information recording medium and sequentially generating a light receiving signal corresponding to the light intensity; a detection section detecting a variation pattern appearing when a signal level of the light receiving signal changes according to the hole; and a code string generating section, when generating a code string corresponding to the signal level, generating a code corresponding to the one hole from the variation pattern if the variation pattern falls within a range and generating a code string, which includes a plurality of codes, from the variation pattern if the variation pattern exceeds the range.

Abstract: An optical pickup includes: an objective lens that collects a first beam and a second beam and emits the first and second beam toward an optical information recording medium on which information can be recorded as a recording mark as a result of being exposed to the first beam; a section that drives the objective lens to focus the second beam on a reflection layer formed on the optical information recording medium, the reflection layer at least partly reflecting the second beam; and a section that changes the convergence state of the first beam to position a focal point of the first beam a distance away from a focal point of the second beam in the direction of depth in order to place the focal point of the first beam at a target depth.

Abstract: An optical information reproducing apparatus includes: an irradiation section irradiating a light beam onto an optical information recording medium, in which holes are formed along a virtual track on a recording medium, along the virtual track; a light receiving section receiving a reflected light beam when the light beam is reflected by the optical information recording medium and sequentially generating a light receiving signal corresponding to the light intensity; a detection section detecting a variation pattern appearing when a signal level of the light receiving signal changes according to the hole; and a code string generating section, when generating a code string corresponding to the signal level, generating a code corresponding to the one hole from the variation pattern if the variation pattern falls within a range and generating a code string, which includes a plurality of codes, from the variation pattern if the variation pattern exceeds the range.

Abstract: An optical pickup includes: an objective lens that collects a first beam and a second beam and emits the first and second beam toward an optical information recording medium on which information can be recorded as a recording mark as a result of being exposed to the first beam; a section that drives the objective lens to focus the second beam on a reflection layer formed on the optical information recording medium, the reflection layer at least partly reflecting the second beam; and a section that changes the convergence state of the first beam to position a focal point of the first beam a distance away from a focal point of the second beam in the direction of depth in order to place the focal point of the first beam at a target depth.