Tektronix, Inc.

Grass Valley (u.s.) Inc.

David Casper

Scott Murray

Paul Edwin O'Connor

Kevin D Windrem

Elaine B Zamani

Anna Greco

James A Delwiche

Neil R Olmstead

James E Blecksmith

Brion L Dunbar

Thomas H Knight

A digital video recorder employing standard hard disk arrays employs a caching system to enable continuous video data to be supplied to and provided from the standard disk drives which may not be adapted for continuous data stream operation. The system is implemented as an array of disk drives and includes cache management functions for governing disk read and write operations. A predictor enables the cache to predict disk reads and disk writes and to maintain the cache based on the predictions. Redundancy enables playback in the event of failure of a drive in the array and also provides improved playback data retrieval time.

Disk-based digital video recorder

Method for predicting what video data should be in a cache which is in a

A dynamically paged non-volatile random access video store has a random access memory integrated with a disk drive. The random access memory provides realtime access for recording and playing back video from and to a video source. The disk drive provides a non-volatile backup for the random access memory by transferring data between the disk drive and random access memory automatically, or by command, on a non-realtime basis. The video data accesses and transfers are handled by a microprocessor that interfaces with a controller by which an operator inputs instructions. Multiple channels are accommodated via a channel interface, also controlled by the microprocessor, between external video devices and the random access memory. The disk drive stores a plurality of pages of video data, each page corresponding to the capacity of the random access memory.

Dynamically paged non-volatile random access video store

Growing community of inventors

Oregon House, CA, United States of America

David Casper