U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Method for reducing magnetic storage volume for computer disk image backup

Patent 5274807 Issued on December 28, 1993. Estimated Expiration Date: Icon_subject December 28, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Patent References

Database backup method
Patent #: 4686620
Issued on: 08/11/1987
Inventor: Ng

Real time data transformation and transmission overlapping device
Patent #: 4956808
Issued on: 09/11/1990
Inventor: Aakre, et al.

Method for transferring data between memories Patent #: 5109485
Issued on: 04/28/1992
Inventor: Smith, Jr.

Inventors

Assignee

Application

No. 607922 filed on 11/01/1990

US Classes:

707/205File allocation

Examiners

Primary: Heckler, Thomas M.

Attorney, Agent or Firm

International Class

G06F 012/06

Abstract

A computer data backup method where copying of data blocks from one medium to another is deferred until a data structure, e.g. a bit map, is generated defining those data blocks that in fact contain data. The data structure is then read to copy to the backup medium the data-containing blocks as defined by the data structure. Since the data structure is generated before the copying is effected, a range of contiguous data-containing blocks is determinable such that all the blocks of that contiguous range may be copied as a single continuous operation. The magnitude of required backup storage is reduced by eliminating the copying of empty blocks in general unless the number of empty blocks between two ranges of contiguous data-containing blocks is less than a predefined number.

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