Hitachi, Ltd.

Hitachi Consumer Electronics Co., Ltd.

Hitachi-lg Data Storage, Inc.

Osamu Kawamae

Toshifumi Takeuchi

Taku Hoshizawa

Shigeki Taira

Yutaka Nagai

Harukazu Miyamoto

Hiroshi Yoshiura

Yukari Katayama

Masayuki Hirabayashi

Hiroyuki Kimura

Hiroshi Hirayama

Junji Shiokawa

Takeshi Maeda

Takao Arai

Seiichi Saito

Masafumi Nakamura

Masaru Takahashi

Shinji Fujita

Masaaki Kurebayashi

Shuichi Sagano

Koichiro Nishimura

Masakazu Ikeda

Manabu Katsuki

Yasuo Mutsuro

Shinichi Obata

Izumi Kimura

Hiroshi Tadokoro

Hisahiro Hayashi

Eijiro Tazawa

Takashi Yoshida

Yuji Ishikawa

Yoshifumi Takeuchi

Toshifumi c/o Hitachi Ltd Takeuchi

A storage system having a plurality of optical disc devices allows other optical disc devices inside the storage system to reproduce the optical disc recorded by a certain optical disc device but inhibits optical disc devices outside the storage system to reproduce the optical disc. A device key as a base for generating an encryption key is common to the plurality of optical disc devices. In the optical disc devices, a guest key other than the device key can be used temporarily to generate the encryption key. An authentication list containing a reproduction condition is recorded with the key information to the optical disc.

Optical disc, optical disc recording method, optical disc reproduction method, optical disc device and storage system

There are provided an optical disc device and its recording/reproducing method for managing the management information about plural optical discs efficiently. In the present invention, the management information about the plural optical discs is stored in a memory. Moreover, the management information about part or all of the optical discs stored in the memory is recorded in the optical disc.

Optical disc device and optical disc recording/reproducing method

The present invention relates to a recording/reproducing device that records data on a double-sided recordable optical disk for storage and management purposes. The device includes a unit which stores a plurality of optical disks, a unit which records data onto and reproduces data from an upper side of an optical disk, a unit which records data onto and reproduces data from a lower side of an optical disk, a unit which conveys an optical disk between the disk storage unit and each recording/reproducing unit. When a request for reading data recorded on the lower side of the disk is received while the upper side is being written onto, a control unit interrupts a data recording process on the upper side, reproduces data recorded on the lower side, and after completion of reproducing the recorded data, resumes the interrupted data recording process.

Recording/reproducing device

A magazine detachably installed in a main body of a disc changer is divided into sections by partitions for storing a large number of optical discs. The magazine is provided with a belt set around rollers, which carries the optical disc in contact with the belt. In the disc changer, the belt is rotated by a gear of the roller, which is engaged with an external drive gear for taking the optical disc through rotating movement. Among the optical discs which have been taken, a target optical disc opposite the slit of the disc control plate passes through the slit, and the other optical discs stop while abutting against the disc control plate. The optical disc which has passed through the slit is inserted into disc carriage rollers, and further carried to the drive for recording/reproducing.

Disc changer with detachable optical disc storage magazine for storing multiple optical discs

A data recording and reproducing apparatus relative to a data library device includes a plurality of setup units for recording and reproducing data in a record and reproduction condition appropriate to a recording medium, and a storage unit for storing identification information and medium information of the recording medium, in this way, a setup processing is performed to reproduce the identification information from the recording medium when loading the recording medium, the medium information corresponding to the identification information is read out from the storage unit to perform the setup processing by a second setup unit when the medium information corresponding to the identification information is present in the storage unit, and the setup processing is performed by a third setup unit to reproduce the medium information from the recording medium and store in the storage unit together with the identification information, shortening a time period of the setup processing.

Data recording and reproducing apparatus and data library device

There is provided a method of calculating the degradation over time of the quality of data recorded on an optical disk in a short time. In the method, when user data is recorded on a data area, a test signal including a component in which the signal level is smaller than a reference value, is recorded on a test area. Then, the test signal is reproduced from the test area when a predetermined time has passed, to calculate the quality degradation of the user data from the evaluation result. Alternatively, every time when the user data is recorded/reproduced on/from the data area, the test signal is recorded/reproduced repeatedly on/from the test area. Then, the test signal is reproduced from the test area at a predetermined timing, to calculate the quality degradation of the user data from the evaluation result.

Recording quality evaluation method of optical disk and optical disk storage system

A digital data recording/reproducing method includes the steps of: interleaving data on a PI code for each PI code of a 208-row ECC block; and converting a short burst error into random errors by dispersing errors on the PI codes. Moreover, the digital data recording/reproducing method increases correction capability against several bytes to several tens bytes of errors generated at random without changing burst error correction length by performing this processing for respective PI codes by using interleave rules that are different as much as possible from one another.

Method of recording/reproducing digital data and apparatus for same

Even when recording data which is continuously inputted at a high speed, it is possible to correct a recording error and reproduce preferable AV data without a noise upon reproduction. A recording error detection circuit () detects an error generation upon recording according to the fluctuation of amplitude of a tracking error signal or a focus error signal. A recording signal processing circuit () again records (performs skip recording) the same data in a region subsequently adjacent to a region where a recording error has occurred. When performing the skip recording, address information contained in the recording data is rewritten into address information on a new recording region. Moreover, an identifier (skip mark) indicating that a recording error has occurred is added to the pattern of the link region of the recording data.

Optical disc device, optical disc recording method, and reproduction method

If a large minimum data unit for recorded data is used to record a small data amount of management information, the recording time is long, and furthermore when a WO (write once) is used as the recording medium, the number of recording operations is restricted. To solve the above problems, the present invention records data in a management area in units smaller than ordinary units for recorded data to suitably record information in a limited management area and thereby efficiently use the user data area. At that time, the present invention simplifies interleave processing usually applied to ordinary recorded data, and performs the simplified interleave processing on a data structure (for data of small size) of the present invention so as to ensure the signal processing compatibility between the ordinary data and data having the data structure according to the present invention.

Recording and reproducing data to/from a recording medium having a user data area and an information area for storing information about the recording medium

An authentication method for use in sending/receiving data between a coded data output apparatus for outputting coded data having a water mark, and a recording apparatus for recording data onto a recording medium, the method including: deciding a type of the recording medium used by the recording apparatus; based on a result of the deciding, selecting, from a plurality of authentication methods, an authentication method corresponding to the type of the recording medium, and conducting authentication between the coded data output apparatus and the recording apparatus, using the authentication method; sending/receiving data between the coded data output apparatus and the recording apparatus after conducting the authentication; and in a case where the coded data has the water mark, detecting the water mark by the coded data output apparatus, wherein the data exchanged between the coded data output apparatus and the recording apparatus is scrambled by a scrambling method corresponding to the type the recording medium.

Reproducing apparatus, recording apparatus and display apparatus

To update the program, the file is updated by verifying according to a digital signature attached to the file having the program converted whether the file is not dishonestly falsified. To verify the digital signature, a time for verifying the signature can be shortened by verifying not the entire file but only a particularly important part, and an area for temporarily storing the file can be made small. Thus, the control can be performed to update only when the file is valid.

Control device, update method and control software

A system effecting a data reproducing method for a plurality of devices, for sending and receiving data by authenticating the plurality of devices with each other, said data reproducing method including: selecting, from a plurality of descrambling methods, a descrambling method corresponding to a type of said data, executing authentication by an authenticating method corresponding to the selected descrambling method, where the authenticating method is selected from a plurality of authenticating methods, and reproducing said data.

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Yokohama, Japan

Osamu Kawamae