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:
Mar. 27, 2001
Filed:
Nov. 17, 1997
Franz H. U. Frank, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
Reading partly written record carriers using a reading device which positions the read head on the basis of written marks presents problems when an information block behind a non-written area must be read. A writing device and a method of writing information blocks on a record carrier of a rewritable type such as a CD-RW or a DVD-RAM include the following. First, record carrier areas which are in use for writing information blocks, are detected, for example, using the corresponding writing instructions. Subsequently, it is detected whether boundary areas adjoining the areas which are in use are unwritten. In that case, the boundary areas are initialized by writing them with dummy information, preferably with dummy information blocks comprising address information in the conventional manner. A record carrier is provided with status information which is indicative of the non-written state of areas. A reading device is provided with search means for searching written areas. Apparatus is provided for programming a computer system to provide programmed apparatus to implement the method.