| Patent Number |
Title Of Patent |
Date Issued |
| 5388105 |
Method of recording/reproducing optical disk data |
February 7, 1995 |
| A method of recording and reproducing data on and from a rewritable optical disk used for recording/reproduction of data on a sector by sector basis. A dummy block or a parity subject to error detection and correction coding is additionally recorded at the rear of a data block on a secto |
| 5359584 |
Data recording/reproducing method and apparatus having means for reliable detection of unrecorde |
October 25, 1994 |
| In recording data on a disk-shaped information recording medium having formed thereon a plurality of concentric or spiral tracks each being divided into a plurality of sectors each having an ID field and a data field, a data mark is selected from a plurality of distinct data marks ac |
| 5073887 |
Optical disk recording and reading system with directory data access mechanism |
December 17, 1991 |
| Directory data relating to user data are recorded in sectors of a checkerboard pattern or in sectors on every other track in a directory data area on an optical disk. The sectors which store the directory data are always flanked by adjacent virgin sectors in a direction normal to the |
| 5054017 |
Optical information reproducing apparatus |
October 1, 1991 |
| In the reproduction of data from one of N-frame sectors of an optical disk, data marks representing the front ends of the respective frames of a desired sector are detected and counted. When the number of the data marks is more than a predetermined value M (1<M.ltoreq.N), the reproduc |
| 5051998 |
Data block deinterleaving and error correction system |
September 24, 1991 |
| A deinterleaving and error correction system which is advantageously utilized in a playback system of an optical recording disk apparatus. As each block of sector data, encoded for example with the Reed-Solomon error correction code with block interleaving, is read from the disk, the |
