摘要:
An inspection sector area is disposed on each data sector area of the recording area of an optical disc, and predetermined reference inspection data is recorded in the inspection sector area of a new optical disc before use. The recorded inspection data is reproduced and the number (Ej) of data errors which initially occur in the optical disc is detected by comparing the reproduced inspection data with the inspection data during recording and is memorized in the optical disc. During operation, the recorded inspection data is reproduced and compared with the reference data, and the number (Em) of data errors is issued, thereby producing the number of data errors due to particulate contamination as given by a difference between the numbers (Ej) and (Em).
摘要:
A method and apparatus for recording/reproducing information on an optical disk using the UNIX operating system. The optical disk has a plurality of partitions. An open table is provided to prevent the removal of the optical disk when the optical disk device is in use. The open table manages the use situation of the plurality of partitions. The optical disk is prohibited from being removed from the optical disk device when one partition is opened earlier than the other partitions. The removal prohibition of the optical disk is released when the final partition is closed.
摘要:
An information recording-reproducing apparatus for optimizing data transfer between a host computer and an information recording medium. The apparatus has a transfer mode control device which selects the optimal data transfer operation mode for transferring data between the host computer and the information recording medium. The transfer mode control device determines which one of a duration of a modulation-demodulation operation, data transfer from the apparatus to the information recording medium, and a duration of a data transfer operation, transfer of data from the apparatus to the host computer, is longer. The transfer mode control device selects a parallel mode in which the modulation-demodulation operation and the data transfer operation are performed in parallel when a duration of the modulation-demodulation operation is longer than the data transfer operation. The transfer mode control device selects a buffering mode in which the modulation-demodulation operation and the data transfer operation are performed sequentially when a duration of the data transfer operation is longer than the modulation-demodulation operation.
摘要:
A bit error measuring apparatus in which bit errors in a rewritable information recording medium are measured by reproducing data after the data have been repeatedly recorded on the medium, in which position of recording data used in random number data generated in a memory is periodically shifted every time recording is performed such that not only different recording data can be repeatedly recorded at a predetermined area of the medium at high speed but bit errors can be detected at identical bit locations of the medium by reproducing data from the predetermined area only when the identical recording data have been recorded.
摘要:
A multi-layered optical disk comprising a plurality of recording layers accumulated in the thickness direction wherein a light beam is focused on one of tracks of one of the layers thereby to record and reproduce data, the optical disk being characterized in that recording layers each have an identification section storing an address of the recording layer which the identification section belongs to.
摘要:
A multi-layered optical disk comprising a plurality of recording layers accumulated in the thickness direction wherein a light beam is focused on one of tracks of one of the layers thereby to record and reproduce data, the optical disk being characterized in that recording layers each have an identification section storing an address of the recording layer which the identification section belongs to.
摘要:
A multi-layered optical disk comprising a plurality of recording layers accumulated in the thickness direction wherein a light beam is focused on one of tracks of one of the layers thereby to record and reproduce data, the optical disk being characterized in that recording layers each have an identification section storing an address of the recording layer which the identification section belongs to.
摘要:
An information recording and reproducing apparatus includes a rewritable optical disc having a plurality of sectors on which data can be rewritten. The rewritable optical disc is divided into an additionally recordable region in which the data are additionally recorded and a rewritable disc control region in which an address of a latest recorded sector in the additionally recordable region is recorded. The optical disc is used as an additionally recordable optical disc in which recording is permitted only one time and reproduction can be performed plural times. The information recording and reproducing apparatus further includes a control circuit for recording data on unrecorded sectors in the additionally recordable region and for reading the data from recorded sectors. This control circuit can rewrite and reproduce data in the disc control region. The control circuit reads the disc control region prior to additional recording of data, thereby finding a first unrecorded sector from the address of the latest recorded sector recorded in the disc control region. Furthermore, the control circuit records data on unrecorded sectors following the first unrecorded sector, and upon termination of data recording, the address of the latest recorded sector in the disc control region is rewritten.
摘要:
In data recording medium used with the apparatus of the present invention, there are allocated a sequential access zone consisting of a data area for recording real time data such as sounds or video images, a C list area for recording a C defect list managing defective sectors detected in the formatting process, and a G list area for recording a G defect list managing defective sectors detected in the recording process of data, and a random access zone consisting of a data area for recording random access data such as code data, a spare area for replacing defective sectors detected in the recording process, and an R list area for recording an R defect list managing the relation between defective sectors and corresponding spare sectors. In the recording process of data in the sequential access zone, data is recorded while defective sectors registered in the C defect list and G defect list are skipped, thereby achieving recording of both the random access data and the real time data. Moreover, sequential reproduction of real time data is realized.
摘要:
In a plurality of sectors in a track of an optical disc, when defect sectors having defect are a lesser number than a predetermined number, a substitution sector in a first substitution area of the optical disc is substituted for the defect sector, and when the number of the defect sector is the predetermined number or more, the sectors of a substitution track in a second substitution area is substituted for entire sectors in the track, then a map data including the address of the track and the address of the substitution track are recorded in a map sector of a map sector area.