Method and system for managing image files

• US 7,334,099 B2
• Filed: 06/28/2002
• Issued: 02/19/2008
• Est. Priority Date: 06/28/2002
• Status: Expired due to Fees

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Schumacher, Sara J., Witt, Wesley A., Raghavan, Kartik N.
• Primary Examiner(s): Zhen; Li B.
• Application Number:
  US10/184,257
• Publication Number:
  US 20040003103A1
• Time in Patent Office: 2,062 Days
• Field of Search: 707/200, 707/202, 707/204, 711/162, 711/161
• US Class Current: 711/162
• CPC Class Codes: G06F 11/1464 for networked environments
• CPC Class Codes: Y10S 707/99953 Recoverability
• CPC Class Codes: Y10S 707/99954 Version management

Abstract

A method and system for managing image files is provided. The image files include a plurality of streams such as a control stream, a data stream, a bitmap stream, and a cluster map stream. An audit trail stream, properties stream and fix-up stream may also be provided. An image driver translates requests from the operating system so that the image can be read, edited or otherwise manipulated.

Claims

1. A method for creating an image file from a source storage media volume to a destination storage media volume, comprising:

opening a source storage media volume;

creating a plurality of image streams, the plurality of image streams comprising at least a control stream, a data stream, a bitmap stream and a cluster map stream;

reading control information from the source storage media volume, the control information identifying a plurality of files on the source storage media volume and clusters allocated to each of the plurality of files, wherein the control stream and bitmap stream are populated on the basis of the control information;

retrieving data from each of the plurality of files identified in the control information;

placing the data of each of the plurality of files to the data stream, wherein only one copy of data is placed to the data stream if a plurality of files on source storage media volume contain the same data;

updating, after placing the data of a file to the data stream for each of the plurality of the files, the cluster map stream by adding a record that correlates cluster location of the data of a file in the source storage media volume to its location in the data stream; and

writing the control stream, data stream, bitmap stream and cluster map stream to a destination storage media to form an image file.

2. The method of claim 1 further comprising the steps of, editing the data and writing the edited data to the data stream in the image file.

3. The method of claim 2 wherein the edited data is written to the end of the data stream.

4. The method of claim 2, wherein the editing comprising:

creating a cluster map record that maps a virtual location for the edited data in the image file to a location in the data stream; and

adding the cluster map record to the cluster map stream.

5. The method of claim 4 wherein the virtual location for the edited data in the image file is determined from a bitmask stream that identifies allocated and unallocated clusters in the image file.

6. The method of claim 1 further comprising the steps of receiving edited data and writing the edited data to the data stream in the image file.

7. The method of claim 6 wherein the edited data is written to the end of the data stream.

8. The method of claim 1, wherein the data in the data stream is compressed.

9. The method of claim 1, wherein the data in the data stream is encrypted.

10. The method of claim 1 wherein the image file further comprises an audit trail stream, further comprising:

creating an audit trait record, the audit trail record identifying a file that includes the set of edited data added to the data stream.

11. A computer-readable medium storing computer executable instructions for a method, comprising:

opening a source storage media volume;

creating a plurality of image streams, the plurality of image streams comprising at least a control stream, a data stream, a bitmap stream and a cluster map stream;

reading control information from the source storage media volume, the control information identifying a plurality of files on the source storage media volume and clusters allocated to each of the plurality of files, wherein the control stream and bitmap stream are populated on the basis of the control information;

retrieving data from each of the plurality of files identified in the control information;

placing the data of each of the plurality of files to the data stream, wherein only one copy of data is placed to the data stream if a plurality of files on source storage media volume contain the same data;

updating, after placing the data of a file to the data stream for each of the plurality of the files, the cluster map stream by adding a record that correlates cluster location of the data of a file in the source storage media volume to its location in the data stream; and

writing the control stream, data stream, bitmap stream and cluster map stream to a destination storage media to form an image file.

12. The computer-readable medium of claim 11 wherein the data in a data stream of the image file is compressed.

13. The computer-readable medium of claim 11 wherein the data in a data stream of the image file is encrypted.

14. The computer-readable medium of claim 11 further comprising:

adding a set of edited data to a location in the data stream;

creating a cluster map record, the cluster map record mapping a virtual location for the set of edited data in the image file to the location in the data stream; and

adding the cluster map record to the cluster map stream effective to allow the set of edited data of the virtual location to be represented at the image file.

15. The computer-readable medium of claim 11 wherein the image file further comprises an audit trail stream, further comprising:

creating an audit frail record, the audit trail record identifying a file that includes the set of edited data added to the data stream.