Microsoft Technology Licensing, LLC

Panasonic Corporation

Microsoft Corporation

Ravisankar V. Pudipeddi

Vishal V. Ghotge

Ravinder S. Thind

Mark J. Zbikowski

Sarosh C. Havewala

Ravinder S Thind

Vishal Vikram Ghotge

Ravisankar V Pudipeddi

Sarosh Cyrus Havewala

Mark Joseph Zbikowski

Neal Robert Christiansen

Darwin Ou-Yang

David Allen Goebel

Karan Mehra

Darren Glen Moss

Rajeev Y Nagar

Yoshiho Gotoh

Garret Buban

Andrew M Herron

Senthil Rajaram

Ran Kalach

Brian Kenneth Dewey

Henry Gabryjelski

David Golds

James Robert Benton

Peter Novotney

James Bovee

David Burg

Lee Edward Prewitt

Eileen C Brown

Oleg Kagan

Matt Garson

Daniel W H Chan

Sameer Chetan Saiya

Hari R Pulapaka

Benjamin M Schultz

William R Tipton

Frederick Justus Smith

Jonathan M Cargille

Balaji Balasubramanyan

Giridhar Viswanathan

Margarit Simeonov Chenchev

Matthew David Kurjanowicz

Dana D Groff

Martijn De Kort

Bryan R Born

Matthew Stuart Garson

Narasimhan Ramasubramanian

Gregory J Jacklin

Nived Kalappuraikal Sivadas

Raphael Gianotti Serrano Dos Santo

Peteris Ledins

Jeremiah J Moon

Ravisankar Pudipeddi

Neal Christiansen

David P Golds

Sarosh C Havewala

Vishal V Ghotge

Securely performing file operations. A method includes determining a trust characteristic assigned to a file. When the trust characteristic assigned to the file meets or exceeds a predetermined trust condition, then the method includes performing a file operation on the file in a host operating system while preventing the file operation from being performed in the container operating system. When the trust characteristic assigned to the file does not meet or exceed the predetermined trust condition, then the method includes performing the file operation on the file in the container operating system while preventing the file operation from being performed directly in the host operating system.

Method and system for persisting untrusted files

Native file encryption support is integrated into an existing file system that does not provide such support, such as the FAT family of file systems, while maintaining backwards compatibility with previous implementations of these file systems.

File encryption support for FAT file systems

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

In a first area of a persistent memory, data is stored that defines a known good state that is operable to launch the computing device to the known good state in response to a reboot. In response to a write request to the first area of persistent memory, the requested write is directed to a second area of the persistent memory and a record of redirected writes to the second area of persistent memory is updated. A request is received to establish an update to the known good state. The updated known good state is operable to launch the computing device to the updated known good state in response to a reboot. In response to the request, the record is persisted such that in response to a reboot, the record is usable to restore the redirected writes, thereby launching the computing device to the updated known good state.

Configurable recovery states

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

In a first area of a persistent memory, state data is stored that defines a known good state that is operable to launch a computing device to the known good state in response to a reboot. Allocation information indicative of free and allocated portions of the persistent memory is accessed. In response to a write request to the first area of persistent memory, when the write request is to an allocated portion of the persistent memory, the requested write is redirected to a second area of the persistent memory. A record of redirected writes to the second area of persistent memory is updated. When the write request is to a free portion of the persistent memory, the write request is allowed to be executed in the first area of persistent memory. The record of redirected writes is updated with the writes to the second area of persistent memory.

Free space pass-through

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

Systems and methods for detecting legacy storage devices that may falsely and/or incorrectly report to host systems that they have removable media. Such false or incorrect reporting may cause the host system to periodically poll the storage device as to whether the device is ready for I/O processing. Such polling would be unnecessary and represent a waste of power expended by the host system. In one embodiment, the present system may implement processes that periodically poll storage media and update a database. The database would be a listing of storage devices indicating whether they truly have removable media or falsely report that they have removable media. In another embodiment, the present system may apply some heuristically testing to determine whether a storage device so falsely indicates removable media. In another embodiment, telemetry service may be used by a group of hosts to share data regarding such storage devices.

Systems and methods for host detection of USB asynchronous notification capability

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

An application programming interface (API) module provides access to data, independent of filesystem implementation in a non-privileged user mode. A discovery volume having a filesystem recognizable by an operating system has cover files which prevent damage to data stored in an unrecognizable primary volume. The discovery volume also includes a data access API available for execution in a non-privileged user mode to render the primary volume accessible by operating systems which would otherwise find the primary volume unrecognizable.

Non-privileged access to data independent of filesystem implementation

Growing community of inventors

Kirkland, WA, United States of America

Ravinder S Thind