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:
Jul. 23, 1991
Filed:
Sep. 18, 1989
Zbigniew B Styrna, Kanata, CA;
Michael Afheldt, Kanata, CA;
Mitel Corporation, Ontario, CA;
Abstract
A data storage system comprised of a disk drive including a magnetic disk for storing an operating system program, a dynamic RAM memory circuit for temporarily storing the operating system program, a static memory circuit for temporarily storing customer entered data, and a direct memory access controller for periodically transferring the customer entered data from the static memory circuit to the magnetic disk and for transferring the operating system program from the magnetic disk to the dynamic RAM memory circuit in response to execution of a bootstrap or power-up program by the microprocessor. In the case of a power down during entry of customer entered data, the customer entered data is saved in the static memory and is transferred to the magnetic disk during the subsequent power up thereby avoiding the use of possibly corrupted data on the disk drive.