Patent ID: 8195624

Claim:
A file system updating method, comprising: creating a change file to store information that identifies changed portions of one or more resources without identifying unchanged portions of the one or more resources; writing, to the change file, update information provided by a first application running on a first operating system, wherein the first operating system does not have control over a shared file system; and writing the update information, stored within the change file, to a shared file managed by the shared file system, wherein the update information is written from the change file to the shared file by a second application running on a second operating system, wherein the second operating system is active only when the first operating system is non-active, wherein the second operating system has control over the shared file system, wherein the first operating system and the second operating system are installed on the same electronic device, wherein the change file is created only by the second operating system and is not accessible simultaneously by the first and second operating system; and wherein the first operating system (a) is a different type of operating system than the second operating system and (b) employs a different locking mechanism than the second operating system.