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Multimedia direct access storage device and formatting method

  • US 5,751,883 A
  • Filed: 05/30/1997
  • Issued: 05/12/1998
  • Est. Priority Date: 06/07/1995
  • Status: Expired due to Term
First Claim
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1. A direct access storage device for buffering at least a chronological portion of a multimedia program defined by non-chronologically ordered source program segments, each of the source program segments being representative of a unique portion of the chronological multimedia program portion, the direct access storage device comprising:

  • at least one data storage disk having a plurality of data storing regions disposed on any of a lower disk surface and an upper disk surface, the plurality of data storing regions defining a presentation control window buffer;

    a spindle motor for rotating the at least one data storage disk;

    an actuator having elongated arms;

    a transducer disposed on each of the elongated arms; and

    a controller that coordinates writing of the non-chronologically ordered source program segments to the presentation control window buffer and coordinates reading of the non-chronologically ordered source program segments from the presentation control window buffer as chronologically ordered local program segments, the controller coordinating writing of the source program segments to the presentation control window buffer in accordance with the equations;

    
    
    space="preserve" listing-type="equation">SC=D×





    S0; and

    PTD=D×





    T0;

    where;

    SC is defined as a nominal storage capacity used for supporting the presentation control window buffer in megabytes;

    D is defined as a number of data storage disk surfaces used for supposing the presentation control window buffer,M is defined as a number of segment blocks per data storage disk surface used for supporting the presentation control window buffer,L is defined as a length of each segment block as measured by the number of source program segments;

    S0 is defined as an average size of each of the source program segments in megabytes;

    PTD is defined as a duration of the presentation control window buffer in seconds; and

    T0 is defined as a decompressed full-motion program time in seconds corresponding to each of the source program segments.

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