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:
Jun. 25, 1996
Filed:
May. 04, 1994
Takao Yamaguchi, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A device for driving the disk-type recording medium, such as a magnetooptical disk, has a read and write system for reading data from and writing data on the disk-type recording medium. The read and write system is self-diagnosed by generating time data which vary with time after the device is turned on, and detecting when the disk-type recording medium is loaded into the device, generating test data depending on the time data at the time the disk-type recording medium is loaded as detected, writing the test data in a predetermined area on the disk-type recording medium with the read and write system, reading the written test data from the predetermined area on the disk-type recording medium with the read and write system, and determining whether the test data read from the disk-type recording medium agree with the generated test data.