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:
Jan. 04, 1994
Filed:
Dec. 19, 1989
Gregory Kenley, Northboro, MA (US);
George Ericson, Schrewsbury, MA (US);
Richard Fortier, Acton, MA (US);
Chuck Holland, Northboro, MA (US);
Robert Mastors, Ayer, MA (US);
James Pownell, Natick, MA (US);
Tracy Taylor, Upton, MA (US);
John Wallace, Franklin, MA (US);
Neil Webber, Hudson, MA (US);
Epoch Systems, Inc., Westborough, MA (US);
Abstract
A digital data storage apparatus has primary, secondary and backing storage elements characterized by respectively longer access times. A level detector signals when the quantity of data in the secondary store exceeds a threshold amount. A data migrator responds by moving selected data files from the secondary store to the backing store. The apparatus also includes a baseline back-up element that stores archive copies of a set of selected data files. A full back-up element stores archive copies of those files that, (1) were originally copied to the baseline back-up set but have since changed, or (2) are not otherwise within the baseline back-up set. For those files which were originally copied to the baseline back-up set and which have not changed, the full back-up element stores pointers indicating locations of the respective files in the baseline back-up set.