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:
Nov. 14, 1995
Filed:
Jun. 20, 1994
Lloyd R Shipman, Jr, San Jose, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
The present application may be utilized for enhanced maintenance of data stored on storage media within a data processing system storage subsystem. Data to be stored is first subdivided into multiple blocks and subblocks, segments or tracks. Each subdivision of data is then analyzed and appropriate logical Error Correction Codes (ECC) are calculated and inserted into the data at selected locations to permit certain data errors to be corrected by subsequent processing. Thereafter, the data and associated logical Error Correction Codes (ECC) are then coupled to a head/disk assembly within a storage subsystem. A physical Error Correction Code (ECC) logic circuit is then utilized to analyze the data and logical Error Correction Codes (ECC) and appropriate physical Error Correction Codes (ECC) are then calculated and inserted into the data at selected locations in response to the storage of the data and logical Error Correction Codes (ECC) within the storage media. Maintenance of the storage media and data may then be separately accomplished utilizing independent logical and physical Error Correction Code (ECC) circuits which operate separately upon the logical and physical Error Correction Codes (ECC) wherein media defects will not necessarily result in a loss of all data present within the defective media segment.