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Method-for-predicting-what-video-data-should-be-in-a-cache-which-is-in-a-disk-based-digital-video-recorder

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Details

Inventors: Windrem, Kevin D.; Casper, David; Greco, Anna; Murray, Scott; O'Connor, Paul; Zamani, Elaine B.;
Assignee: Tektronix, Inc. (Wilsonville, OR)
Primary Examiner: Chin; Tommy P.
Assistant Examiner: Vincent; David R.
Attorney, Agent or Firm: Gray; Francis I.

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.

DETAILED DESCRIPTION Cache management/disk utilization for a digital video recorder according to the present invention employs a cache in conjunction with an array of inexpensive disk drives for recording and playing video signals.
The cache is such that data coming in or going out (e.
g.
, digital video) is buffered in the cache through a cache management algorithm, thereby compensating for the periods when the disks may be unable to transfer data.
Data is maintained in video and audio blocks, enabling use and modification of either or both of video data and audio data.
In playback mode, e.
g.
, the cache management includes retrieving playback data from the disks in advance of their use, and storing this information in the cache, and making data available for output.

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