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:
Aug. 15, 1995
Filed:
Nov. 05, 1992
Kengo Sudoh, Higashihiroshima, JP;
Yuji Sumitomo, Yamatokouriyama, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
In a recording and reproducing apparatus, a plurality of data groups having arbitrary data capacities are recorded in and reproduced from a memory card formed of a plurality of batch erasable semiconductor memories having equal capacities. At least one of the plurality of semiconductor memories is set to be a spare memory which does not contain recorded data. To erase only one data group, those data groups (other than the data group to be erased) stored in the same semiconductor memory containing the data group to be erased are recorded in the spare memory. Individual index data and card index data including updated reproduction order data and rewrite number data are also recorded in the spare memory. Thereafter, the semiconductor memory containing the data group to be erased is batch-erased and becomes a new spare memory.