05276867 is referenced by 921 patents and cites 9 patents.

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.

Title
Digital data storage system with improved data migration
Application Number
7/454066
Publication Number
5276867
Application Date
December 19, 1989
Publication Date
January 4, 1994
Inventor
Neil Webber
Hudson
MA, US
John Wallace
Franklin
MA, US
Tracy Taylor
Upton
MA, US
James Pownell
Natick
MA, US
Robert Mastors
Ayer
MA, US
Chuck Holland
Northboro
MA, US
Richard Fortier
Acton
MA, US
George Ericson
Schrewsbury
MA, US
Gregory Kenley
Northboro
MA, US
Agent
Lahive & Cockfield
Assignee
Epoch Systems
MA, US
IPC
G06F 15/40
G06F 12/00
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