The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 16, 2003
Filed:
Mar. 28, 2000
Morihiro Murata, Hamamatsu, JP;
Yamaha Corporation, Hamamatsu, JP;
Abstract
Upon loading of an optical disk into a CD-R/RW drive, access is first made to a given location within an innermost lead-in area of the optical disk, to retrieve a starting time of the innermost lead-in area from ATIP information. Then, access is made to a starting point of a PMA area of the disk, on the basis of the starting time of the innermost lead-in area, to retrieve PMA information. After that, on the basis of a time interval between adjoining tracks represented by the PMA information, the tracks are divided into a plurality of sessions. Next, access is made to a lead-in area of the last session to determine presence/absence and validity of lead-in information in the last session. Then, only when the lead-in information of the last session is judged to be valid, the lead-in information of the last session is retrieved as valid lead-in information. This way, for each multi-session-recorded CD-R or CD-RW disk, it is possible to reliably avoid erroneous retrieval of information of any old session that should have been erased previously from the disk.