COMPUTER DUPLICATION SYSTEM, WHICH OPERATES WITH OPEN FILES Russian patent published in 2000 - IPC

FIELD: computer engineering. SUBSTANCE: duplication software of computer system which has hard disk drive monitors storage of changes which are made in data of file under duplication. Upon duplication, both parts of source and corrected file or record are stored. Duplication software reads source data wile other applications read corrected data. Detection of the fact whether reading operation is called by duplication software or another application is achieved by system using stack, and reading request source, asking user, identifiers of task or process. Access to file for duplication software is provided by system file allocation table processing. The fact that file is kept in "good" condition is ensured by delay of start of duplication operation for given period. EFFECT: protection against failure of storage device or damage, loss or infection of data by computer virus. 16 cl, 6 dwg