Microsoft Technology Licensing, LLC

Microsft Corporation

Ravisankar V Pudipeddi

Ravinder S Thind

Vishal Vikram Ghotge

Sarosh Cyrus Havewala

Mark Joseph Zbikowski

David Allen Goebel

Neal Robert Christiansen

Ran Kalach

Luis Felipe Cabrera

Brian Kenneth Dewey

Eileen C Brown

David Michael Callaghan

Eric P Traut

Sachin C Patel

Neill Michael Clift

David Golds

Ping Xie

Suyash Sinha

Craig Ashley Barkhouse

Stefan Robert Steiner

Adam D Stritzel

Geir Olsen

Deborah C Jones

JianMing M Zhou

Dylan D'Silva

Revinder S Thind

Christopher D Russell

Michael John Novak

Lei Shi

Karandeep Singh Anand

Dilip Madhusudan Ranade

Jonathan M Cargille

Garret Buban

Scott A Brender

Scott Colville

Eric C Perlin

Abid Ali

Dana D Groff

Pankaj Khanzode

Daniel Edward Lovinger

Manoj K Valiyaparambil

Ramesh Shankar

Amit Singla

Atm Shafiqul Khalid

Patrick E Bozeman

Supriya Wickrematillake

Vanita Prabhu

Charumathy Srinivasan

Mukul Gupta

Kevin Y Seng

Sriram Balasubramaniam

Jianming Zhou

Pankaj V Khanzode

Storage virtualization techniques allow files and directories to be stored remotely, for example, by a cloud storage provider, but in a manner that appears to a user or application running on a local computing device as if the files are stored locally&#x2014;even though the data of those files and directories may not be resident on the local computing device. That is, the contents of files and directories that may exist in the cloud look and behave as if they were stored locally on a computing device. The level of hydration of placeholders may be monitored and operations may be performed to reduce the impact of excessive hydration on the resources of the computing device.

Preventing excessive hydration in a storage virtualization system

Storage virtualization techniques allow directories to be stored remotely, for example, by a cloud storage provider, but in a manner that appears to a user or application running on a local computing device as if the directories are stored locally&#x2014;even though the data of those directories may not be resident on the local computing device. That is, the contents of directories that may exist in the cloud look and behave as if they were stored locally on a computing device.

Storage virtualization for directories

A method of updating a file record on at least one of a first one or more computer readable storage media including writing at least three contiguous DirectoryEntry data structures corresponding to a directory entry set, the directory entry set corresponding to a file, the writing occurring to the at least one of a first one or more computer readable storage media.

Quick filename lookup using name hash

An extensible file system format for portable storage media is provided. The extensible file system format includes the specification of primary and secondary directory entry types that may be custom defined. The primary and secondary directory entry types can be further classified as critical and benign directory entries. The directory entry types can define whether a cluster chain corresponding to a file can be contiguously allocated.

Extending cluster allocations in an extensible file system

An extensible file system format for portable storage media is provided. The extensible file system format includes the specification of primary and secondary directory entry types that may be custom defined. The primary and secondary directory entry types can be further classified as critical and benign directory entries.

Extensible file system

Disclosed is a method for creating and reading a contiguous file in an extensible file system. During the creation of a file on the storage media, the file system format check the bitmap to determine if there are areas of free space on the media that would permit the storage of the file in a contiguous manner. By storing the file in a contiguous manner the file may later be read without resorting to the file allocation table, because the file itself would not be fragmented on the storage media. Once an area of free space has been identified, the file is written to the media in a contiguous manner. Further, an associated entry for the file in the directory entry is updated or created to indicate that the file is a contiguous file and also provides basic parameters necessary to read the file without resorting to accessing the file allocation table.

Contiguous file allocation in an extensible file system

Applications are stored on removable storage of a mobile device in an encrypted form to provide isolation and piracy protection. In one implementation, each application is encrypted using its own associated encryption key that is generated based on an identifier of the application and a master key that is associated with a trusted platform module of the mobile device. In another implementation, each application is encrypted using two associated encryption keys. One key is used to encrypt binary data associated with the application such as source code, and the other key is used to encrypt application data such as graphics and configuration files. The encryption keys are each generated using the identifier of the application, the master key, and identifiers of the folders where the corresponding data types are stored on the mobile device. The removable storage includes SD cards formatted using the FAT or exFAT file systems.

Content item encryption on mobile devices

Described is maintaining cached hash values for files in association with state data for each file that represents the state of that file's contents at the time of hashing. For example, in a journaling file system, the state data may comprise the update sequence number of the file in the journal and a journal identifier for that journal instance. A request for a hash value for a file is processed by determining whether a cached hash value is maintained for that file. If so, and the associated maintained state data matches current state data for the file, the file contents are unchanged since the last hash computation, whereby the cached hash value is returned in response to the request. Otherwise, a new hash value is computed for the file and returned, and cached for future use. Multiple types of hashes may be cached for a given file.

Efficient file hash identifier computation

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Bellevue, WA, United States of America

Ravisankar V Pudipeddi