System and method for synchronizing objects between two devices

• US 6,996,633 B2
• Filed: 11/17/2004
• Issued: 02/07/2006
• Est. Priority Date: 10/12/1998
• Status: Expired due to Fees

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Wu, Charles
• Primary Examiner(s): Donaghue, Larry D.
• Application Number:
  US10/990,677
• Publication Number:
  US 20050071468A1
• Time in Patent Office: 447 Days
• Field of Search: 709220-225, 709/217, 709/219, 707/201, 707/203, 707/10, 717/168, 717/173, 710/5, 710/20
• US Class Current: 709/224
• CPC Class Codes: G06F 16/275 Synchronous replication
• CPC Class Codes: H04L 67/1095 Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
• CPC Class Codes: H04L 69/329 in the application layer [OSI layer 7]
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: Y10S 707/99952 Coherency, e.g. same view to multiple users

Abstract

A synchronization system synchronizes objects between a portable computer and a desktop computer. The portable computer is capable of communicating with a storage volume that can become inaccessible to the portable computer. The system identifies storage volumes currently available to the portable computer and identifies storage volumes previously accessible to the portable computer, but not currently accessible to the portable computer. Objects contained in storage volumes that are currently accessible to the portable computer are then synchronized between the base computer and the portable computer. During the synchronization process, the system ignores objects stored on volumes that are not currently accessible to the portable computer. However, the system continues to monitor and record changes to objects stored on volumes that are not currently accessible to the portable computer. When a storage volume that was previously inaccessible becomes accessible, the system synchronizes objects stored on the previously inaccessible storage volume. The objects may be databases or other data structures. The storage volume that can become inaccessible to the portable computer is typically a removable memory card that can be inserted into the portable computer.

Claims

1. A synchronization manager for removable data storage devices, comprising:

means for identifying removable data storage devices currently accessible to a first computing device, wherein the removable data storage devices store objects;

based on the identification of the removable data storage devices currently accessible to the first computing device, means for identifying objects subject to deletion from a second computing device during a synchronization process to occur between the first computing device and the second computing device;

means for preventing deletion of the objects subject to deletion during the synchronization process; and

means for synchronizing only objects contained in the removable data storage devices currently accessible to the first computing device.

2. A synchronization manager for removable data storage devices, comprising:

a device connection sensor to identify removable data storage devices currently accessible to a first computing device, wherein the removable data storage devices store objects;

an object deletion identifier to identify objects subject to deletion from a second computing device during a synchronization process to occur between the first computing device and the second computing device based on the identification of the removable data storage devices currently accessible to the first computing device;

an object deletion blocker for preventing deletion of the objects subject to deletion during the synchronization process; and

an object synchronization discriminator for synchronizing only objects contained in the removable data storage devices currently accessible to the first computing device.

3. The synchronization manager as recited in claim 2, wherein the removable storage devices are removable disk drives.

4. The synchronization manager as recited in claim 2, wherein the removable storage devices are removable memory cards.

5. The synchronization manager as recited in claim 2, wherein the object deletion blocker identifies removable data storage devices as previously accessible to the first computing device but not currently accessible to the first computing device and while synchronizing, ignores objects stored on the second computing device corresponding to objects on removable data storage devices previously accessible to the first computing device but not currently accessible to the first computing device.

6. The synchronization manager as recited in claim 2, wherein each object comprises a plurality of data items, and wherein the object synchronization discriminator synchronizes data items in one object with corresponding data items in another object.

7. The synchronization manager as recited in claim 2, wherein the objects are databases.

8. The synchronization manager as recited in claim 2, wherein the first computing device is a portable computer.

9. The synchronization manager as recited in claim 2, wherein the second computing device is a desktop computer.

10. The synchronization manager as recited in claim 2, wherein the second computing device continues to monitor and record changes to objects stored on the second computing device that are inaccessible to the first computing device.

11. The synchronization manager as recited in claim 2, wherein when a removable data storage device that was previously inaccessible becomes accessible, the object synchronization discriminator synchronizes objects stored on the previously inaccessible removable data storage device.