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. 31, 1998
Filed:
Mar. 10, 1994
Hideto Niijima, Tokyo, JP;
Takashi Toyooka, Kawasaki, JP;
International Business Machines Corporation, Armonk, NY (US);
Abstract
A nonvolatile memory with flash erase capability includes a plurality of clusters each having a plurality of sectors, each of the sectors holding the attribute information for identification. A cluster information sector is placed at the top of a cluster to which it belongs. A data sector is placed in a data area which is the region other than the top of the cluster. A controller connected to the nonvolatile memory creates a cluster information copy sector when erasing a cluster, and reconstructs cluster management information from the cluster information copy sector when initializing a cluster, thereby forming a cluster information sector. Accordingly, endurance against failure such as power failure in a solid state file apparatus using the nonvolatile memory is improved.