A recording medium according to one embodiment of the present disclosure includes a recording layer and an optical thin film. The recording layer includes a heat-sensitive color-developing composition and a photothermal conversion material. The photothermal conversion material absorbs a wavelength in an infrared region and generates heat. The optical thin film is provided on one surface of the recording layer. The optical thin film reflects the wavelength in the infrared region and transmits a wavelength in a visible region.

A recording layer for an optical data recording medium according to one embodiment of the present invention makes it possible to record an information signal by irradiation with laser beam. The recording layer for an optical data recording medium comprises metal oxides including a Mn oxide, a W oxide, and a Sn oxide. The atomic ratio of Mn with respect to the total number of atoms of metal elements constituting the metal oxides is 3-40 atm %.

A recording layer for an optical data recording medium according to one embodiment of the present invention makes it possible to record an information signal by irradiation with laser beam. The recording layer for an optical data recording medium comprises metal oxides including a Mn oxide, a W oxide, and a Sn oxide. The atomic ratio of Mn with respect to the total number of atoms of metal elements constituting the metal oxides is 3-40 atm %.

A heat-assisted magnetic recording device includes a write pole positionable adjacent a magnetic recording medium and configured to write data to the medium. A near-field transducer is situated proximate the write pole and configured to produce a thermal spot on the medium. A channel circuit is configured to generate a sequence of symbols having a length of nT, where T is a channel clock rate and n is an integer over a predetermined range. A write driver is configured to apply bi-directional write currents to the write pole to record the sequence of symbols at a location of the thermal spot on the medium, wherein a duration of applying the write currents to the write pole by the write driver is dependent on a length of the sequence of symbols and the effective thermal spot size.

A multi-bit optical computing system includes an optical source module for generating multi-frequency optical signals. An optical information storage module receives each of the multi-frequency optical signals through an optical path module, and stores them as a plurality of optical information. An optical processing module receives each of the optical information in the optical information storage module via the optical path module according to an external command, generates a plurality of output information, and stores the output information through the optical path module to the optical information storage module.

A multi-bit optical computing system includes an optical source module for generating multi-frequency optical signals. An optical information storage module receives each of the multi-frequency optical signals through an optical path module, and stores them as a plurality of optical information. An optical processing module receives each of the optical information in the optical information storage module via the optical path module according to an external command, generates a plurality of output information, and stores the output information through the optical path module to the optical information storage module.

A multi-bit optical computing system includes an optical source module for generating multi-frequency optical signals. An optical information storage module receives each of the multi-frequency optical signals through an optical path module, and stores them as a plurality of optical information. An optical processing module receives each of the optical information in the optical information storage module via the optical path module according to an external command, generates a plurality of output information, and stores the output information through the optical path module to the optical information storage module.

A multi-bit optical computing system includes an optical source module for generating multi-frequency optical signals. An optical information storage module receives each of the multi-frequency optical signals through an optical path module, and stores them as a plurality of optical information. An optical processing module receives each of the optical information in the optical information storage module via the optical path module according to an external command, generates a plurality of output information, and stores the output information through the optical path module to the optical information storage module.

Long term optical memory includes a storage medium composed from an array of silicon nanoridges positioned onto the fused silica glass. The array has first and second polarization contrast corresponding to different phase of silicon. The first polarization contrast results from amorphous phase of silicon and the second polarization contrast results from crystalline phase of silicon. The first and second polarization states are spatially distributed over plurality of localized data areas of the storage medium.

A control method of an optical disc drive system is provided. Firstly, a first write command is issued to burn a first write data including plural data files to an optical disc in an optical disc drive. If a write fail message from the optical disc drive is received after a specified data block of a specified data file is transmitted to the optical disc drive, the transmission of the first write data is stopped. Then, a data amount of the specified data file that has not been transmitted to the optical disc drive is calculated, and a dummy data with the data amount is generated. Then, the dummy data and the other data files that have not been transmitted are burnt to the optical disc.