摘要:
A CD-ROM is provided with an area for forming a character/graphic pattern. The character/graphic pattern is formed in such a way that data, which generate on the CD-ROM two sorts of pit patterns having average reflectances different from each other to a perceptible extent, are respectively recorded inside and outside the character/graphic pattern. Unless an illegal copy disc is produced by duplicating the legal original disc of the CD-ROM at a very high precision, the character/graphic pattern of the copy disc is invisibly deformed by the discrepancy between the arrangements of the pit patterns of the copy disc and the original disc.
摘要:
A character and/or graphics pattern area for recording specific data is provided on a CD-ROM. When an original disk is prepared, a specific pit pattern corresponding to the specific data is recorded at a first predetermined tracking linear velocity controlled by a specific tracking linear velocity control system for each track so that a character and/or graphics pattern cannot be identified. When a copy disk is produced from the original disk, if data is recorded at a second tracking linear velocity controlled by a specific tracking linear velocity control system, the character and/or graphics pattern of visible size appears on the copy disk because of an optical reflection factor difference between areas caused by placement of the specific pit pattern corresponding to the specific data.
摘要:
A CD-ROM is provided with an area for forming a character/graphic pattern. The character/graphic pattern is formed in such a way that data, which generate on the CD-ROM two sorts of pit patterns having average reflectances different from each other to a perceptible extent, are respectively recorded inside and outside the character/graphic pattern. Unless an illegal copy disc is produced by duplicating the legal original disc of the CD-ROM at a very high precision, the character/graphic pattern of the copy disc is invisibly deformed by the discrepancy between the arrangements of the pit patterns of the copy disc and the original disc.
摘要:
A CD-ROM is provided with an area for forming a character/graphic pattern. The character/graphic pattern is formed in such a way that data, which generate on the CD-ROM two sorts of pit patterns having average reflectances different from each other to a perceptible extent, are respectively recorded inside and outside the character/graphic pattern. Unless an illegal copy disc is produced by duplicating the legal original disc of the CD-ROM at a very high precision, the character/graphic pattern of the copy disc is invisibly deformed by the discrepancy between the arrangements of the pit patterns of the copy disc and the original disc.
摘要:
An interleaved data recording area for recording interleaved file data and a control program record area for recording a program to control the reproduction of the data are provided in an information recording medium, and the interleaved data record area is arranged succeeding the control program record area. Information of a transfer/output destination of the reproduced file data is included in the control program so that a plurality of interleaved and stored file data are continuously reproduced without retrieving control data.
摘要:
A portable CD-ROM retrieval apparatus, is provided wherein a CD-ROM drive for loading a CD medium, a display for displaying characters and images, an input specifying section for specifying a desired input operation, an audio section for producing sounds, and a data storage for storing data from the CD-ROM drive and the like are connected together through a control section, these devices being housed in a single cabinet. In accordance with one feature, the apparatus can calculate and display statistical information which depends on frequency of data access to the CD medium.
摘要:
A first video file managed by a first directory having a DVD standard and a second video file which has High-resolution are recorded on optical disc. Reference information in order to refer to said second video data is recorded in said first video file. This makes it possible to store video data by a different compression method on the standard DVD disc as well as standard DVD video data.
摘要:
A method of recording data of one or more still pictures and still picture group management information for managing said one or more still pictures as a still picture group onto a storage medium, wherein said still picture group management information includes a first recording time at which the still picture data in said still picture group was recorded first and a last recording time at which the still picture data in said still picture group was recorded last, and when new still picture data is recorded in said storage medium, said first recording time in said still picture group management information is replaced by a recording time of the new still picture data.
摘要:
A reproducing apparatus and method for recording/reproducing record information to perform an information recording medium. A drive is provided for recording/reproducing recorded information to/from the information recording medium, and a non-volatile memory memorizes an identifier of the information recording medium loaded on the drive and position information indicative of a position on the information recording medium where the drive records/reproduces the information therefrom. The position information is renewed at one of a predetermined time and a predetermined period.
摘要:
A realtime data recording method allows recovery of recorded file data upon occurrence of a fault, for use as a readable file. Prior to recording, initial management data are generated such that the entire area on a recording medium 1 is reflected as a recording range. After the initial management data has been recorded, data recording is started. During the recording, a writing status of the recording medium (or apparatus) is set as in-writing status, and realtime sector information generated in parallel to data recording is recorded in a non-volatile memory for management of a recording status. Upon restarting after a recording fault, the in-writing status of the recording medium 1 is read to see if the medium has been set open, and inconsistency between the recording information of the sector information and the in-writing status recording information is detected. Correct management data is recorded and re-recorded onto the recording medium.