Sandisk Technologies Inc.

Sandisk Corporation

Chieh-Hao Yang

Po Yuan

Junzhi Wang

Mei Yan

Paul McAvoy

Fabrice Jogand-Coulomb

Farshid Sabet-Sharghi

Xian Jun Liu

Patricia Dwyer

Alon Marcu

Bahman Qawami

Ori Stern

Benjamin Vigier

Susan A Cannon

Pascal Achille Caillon

Bahman Quwami

Robert C Chang

Farshid Sabet-sharghi

June Li

In order to write data to a storage system accessible with a first and second file system, a manager receives a data write request associated with a file. The manager determines if a function supported by the second file system is needed to complete the write request. If so, the file is opened and extended with the first file system. The file is then opened and written to by the second file system. The file is truncated by the first file system, and closed by both file systems. If the second file system function is not needed, the file is opened, written, and closed by the first file system. In order to read data from a storage system using a function supported by the second file system, the second file system's cached storage system index is updated, and then the file is opened, read, and closed by the second file system.

Method and system for accessing a storage system with multiple file systems

A set of code for a peripheral device is installed on a host device. The set of code is used to control access to the peripheral device from the host device. The set of code also contains one or more subsets of code that can be used by software entities on the host device for access to the peripheral device. A software entity on a host device must be successfully authenticated with the set of code installed on the host device. Once the software entity is successfully authenticated, the set of code will provide access to the one or more subsets of code specific to the software entity. The one or more subsets of code can be used by the software entity to access the peripheral device.

Systems for authentication for access to software development kit for a peripheral device

A method of accessing content includes installing a file system filter for a secure removable memory device on a host device. A challenge is sent from the file system filter to a software entity on the host device, and a software entity response is received at the file system filter in response to the challenge. A file system filter response is calculated at the file system filter using the challenge, and access to first content on the secure removable memory device is provided if the software entity response matches the file system filter response.

File system filter authentication

A software entity on a host device attempting to access protected content in a secure memory device must be authenticated using a challenge/response authentication mechanism before the secure file system can be accessed. A file system filter determines whether requested content is protected. If the content is protected, the file system filter provides a challenge to the software entity and generates a file system filter response using the same challenge. The software entity must then send a software entity response using the challenge to the file system filter. If the file system filter determines that the software entity response matches the file system filter response, the software entity is allowed to access the protected content through a secure file system installed on the host device for the memory device.

Methods of storing and accessing data using a header portion of a file are disclosed. In an embodiment, a method of storing content in a non-volatile memory is disclosed. The method includes reading a content file including media content and including a trailer, storing information related to the trailer together with secure data in a header portion of a file, and storing the file to a storage element of the non-volatile memory or a memory area of a host device coupled to the non-volatile memory device.

Method of storing and accessing header data from memory

A portable flash memory storage device such as a memory card can configure a host device upon insertion. The configuration may specify applications or other sequences of operations to be executed by the host upon insertion of the card. Files on the card may be associated with an appropriate application and then automatically opened with the appropriate application. A secure configuration may override a more freely modifiable configuration in certain embodiments.

Auto start configuration with portable mass storage device

Methods of auto starting with portable mass storage device

Growing community of inventors

Sunnyvale, CA, United States of America

Chieh-Hao Yang