Patent ID: 7840702
Filing Date: 2010-11-23
Classification: G06F,H04L

Abstract:
1. A network hard disk copy system for managing multiple clients, the system backing up data stored in a main Personal Computer (PC) to one or more sub PCs, comprising: a main PC generating a check parity signal, transmitting the check parity signal to all sub PCs, receiving response messages to the check parity signal from the one or more sub PCs, checking arrival time of the response messages, determining sub PCs sent the response messages within a reference time to be sub PCs of a first group, copying the data stored in the main PC to the sub PCs of the first group, dividing sub PCs that did not send the response messages within the reference time into two or more groups depending on arrival times of the response messages, classifying sub PCs having faster response message arrival times as sub PCs of a higher group, generating global group information, wherein the global group information includes identification information of all of the sub PCs connected to the main PC and identification information-based group information, wherein the identification information-based group information includes the classified group information of all of the sub PCs, transmitting the global group information to all of the sub PCs connected to the main PC, and transmitting group information output signals enabling all of the sub PCs' own group information to be output to all of the sub PCs when completion signals indicating copying of the data stored in the main PC to all of the sub PCs has been completed are received from all of the sub PCs connected to the main PC; and one or more sub PCs, when receiving the group information output signals from the main PC, extracting each of the own sub PCs' group information from the global group information received from the main PC, generating background images including the extracted group information of the sub PCs in backgrounds of the sub PCs, and outputting the background images, wherein the sub PCs of the first group to which the data stored in the main PC is copied are operated to copy the data stored in the main PC from the sub PCs of the first group to the sub PCs in the two or more groups, wherein the sub PCs of the two or more groups did not send the response messages within the reference time, using the global group information received from the main PC.