Simplivity Corporation

Emc Corporation

Hoverhandle, LLC

David Peter Cordella

Arthur James Beaverson

Steven Bagby

Bruce A Horwitz

Lee W VanTine

Edward George Acciardi

Michael W Healey, Jr

Andrew Michael Agbay

Albert J Agbay

Michael W Healey

A differential control apparatus for a self-balancing scooter includes platform interfaces, such as clamping mechanisms, configured to be rigidly connected to respective foot platforms of the self-balancing scooter, and a differential drive coupler mechanically joined to the platform interfaces to impart differential rotational motion thereto in response to a mechanical control input. A rider interface control mechanism is connected to the differential drive coupler to supply the mechanical control input in response to user control actions to control movement of the self-balancing scooter in operation.

Self-balancing scooter differential control apparatus

Method and apparatus for locating data on disk storage, wherein multiple instances of data can be stored at different locations to satisfy different use requirements such as read access, write access, and data security. The method allows a data storage system, such as a file system, to provide both read optimized and write optimized performance on disk storage of different types (e.g., sizes and speed).

Method and apparatus for differentiated data placement

Allocation process that allows erasure coded data to be stored on any of a plurality of disk drives, in a pool of drives, so that the allocation is not tied to a fixed group of drives. Still further, the encoded data can be generated by any of multiple different erasure coding algorithms, where again storage of the encoded data is not restricted to a single group of drives based on the erasure algorithm being utilized to encode the data. In another embodiment, the encoded data can be 'stacked' (aligned) on select drives to reduce the number of head seeks required to access the data. As a result of these improvements, the system can dynamically determine which one of multiple erasure coding algorithms to utilize for a given incoming data block, without being tied to one particular algorithm and one particular group of storage devices as in the prior art.

Method and apparatus for allocating erasure coded data to disk storage

Described is a technique for asynchronous event notification in a data storage system. Lower level software, such as a device driver or other software application generating events, reports the occurrence of an event to an event handler. The event handler implements an event reporting policy which may include event consolidation. The event handler reports the events to an event dispatcher which notifies event subscribers of the occurrence of events in accordance with registration information of each subscriber. The event handler may execute in kernel mode or user mode depending on the particular execution mode of lower level software initially reporting the occurrence of events. There may be a hierarchical arrangement of multiple event dispatchers in connection with event reporting. Event dispatchers may implement data sharing of registration information.

Asynchronous event notification

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Shrewsbury, MA, United States of America

David Peter Cordella