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:
Apr. 17, 2001
Filed:
Aug. 04, 1998
Kazunori Sekido, Tokyo, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A disk storage system with a RAID architecture, where the disk memory has N units of disks, includes a control unit to write data to the N units of disks or read data therefrom based on instructions from a host equipment, a volatile memory connected to the control unit, and a non-volatile memory connected to the control unit. The volatile memory includes a time stamp memory and a conversion map. The non-volatile memory includes a write buffer, which has a capacity of N×K logical block data (N is a positive integer not less than 2 and K is an integer indicating the number of blocks), and a buffer management table. The control unit accumulates logical block data to be updated in the write buffer until the number of logical blocks reaches N×K−1. It generates logical address tag blocks, including time stamps stored in the time stamp memory and adds them to the N×K−1 logical blocks. The controller then performs a continuous write operation to write N×K logical blocks into empty address areas different from the areas in which data to be updated is stored.