Patent ID: 6327671
Filing Date: 2001-12-04
Classification: G06F

Abstract:
A method of sending changed data from a primary data store to a remote site over a data line of a given bandwidth, the method comprising the steps of:(a) receiving a changed data block comprising changes to an original digital data block;(b) identifying the changed bytes, comprising bytes in the changed data block that are different from corresponding bytes in the original digital data block, by carrying out a data transformation operation, wherein the data transformation operation provides a reduction in the given bandwidth required on the data line by allowing only the changed bytes within the changed data block to be sent, and sending data change information from the primary store to the remote site;(c) recovering the changed bytes at the remote site by performing an inverse transformation operation on the data change information to produce the changed data block; and(d) storing the changed data block at the remote site.