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AssigneeKabushiki Kaisha Toshiba
InventorMikio Yamamuro
Estimating the term…
An apparatus and method for detecting and replacing a defective sector on an optical disk. Recording data and error correction data are recorded on an optical disk at a manufacturing time or an initial time. The recorded data and the error correction data are reproduced in units of one sector. A defective sector is determined when address data in an address field cannot be reproduced or when a number of errors in at least one sector exceeds a specified value. Address data of the defective sector is recorded in a defect list on the optical disk. Recording data and error correction data are successively recorded on the optical disk in a plurality of successive block areas. Defective sectors are skipped and recording data and error correction data are recorded in a unit of one block beginning in a next sector area. When a defective sector is detected after recording the recording data and the error correction data at a time other that the initial time or the manufacturing time, the recording data and the error correction data are recorded in a block area being different than a block area containing the defective sector.
A replacement processing method comprising the acts of:
A replacement processing method comprising the acts of:
A replacement processing method comprising the acts of:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
By using information detectable on the record carrier: by sensing features on the record carrier other than the transducing track ; sensing…
On discs: where blocks are arranged within multiple radial zones, e.g. Zone Bit Recording or Constant Density Recording discs, MCAV discs, MCLV discs
Pulse code modulation systems for audio signals: by adding special bits or symbols to the coded information
Error detection or correction; Testing , e.g. of drop-outs: methods for assignment of alternate areas for defective areas
Term ended 24 Mar 2017 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
This invention relates to a recording and reproducing device for recording data on an optical disk and reproducing data recorded on the optical disk, a recording device exclusively used for recording data on an optical disk, a reproducing device exclusively used for reproducing data recorded on the optical disk, and a replacement processing method for effecting replacement process for a defect area or defect areas in the optical disk device.
Conventionally, an optical disk device for recording data on an optical disk having recording tracks or reproducing data recorded on the optical disk uses laser light emitted from a semiconductor laser oscillator mounted on an optical head.
With the above optical disk device, data is recorded on the optical disk in units of one ECC block, each block being constructed by a plurality of sectors.
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate presently preferred embodiments of the invention, and together with the general description given above and the detailed description of the preferred embodiments given below, serve to explain the principles of the invention.
FIG. 1 is a block diagram showing the schematic construction of an optical disk device for explaining one embodiment of this invention;
FIG. 2 is a plan view showing the schematic structure of an optical disk shown in FIG. 1;
There will now be described an embodiment of this invention with reference to the accompanying drawings.
FIG. 1 shows an optical disk device used as an information recording device. The optical disk device is used to record data (information) or reproduce recorded data by applying converged light to an optical disk (DVD-RAM) 1 used as a recording medium.
For example, the disk 1 is a phase changing type rewritable disk, which is constructed by forming a metal coating layer of tellurium or bismuth in a doughnut form on the surface of a base plate which is formed of glass or plastics in a circular form, in which data is recorded or recorded data is reproduced by using concentric or spiral grooves and lands and on which address data items are recorded at preset intervals by use of recording marks in the mastering step.