Appeal No. 2003-0227
Application No. 09/428,871
failures, and the server digital image data is archived on an
archival medium such as an 8 mm tape drive at regular intervals
to guard against catastrophic failures (col. 4, lines 49-54).
Craig discloses a multimedia server which allocates storage
based on the ranking of a feature and the output of trend
processing performed by a usage probability processor (col. 10,
lines 29-31). Typically, the storage priority, from highest to
lowest priority features, is: DRAM, magnetic disk, high speed
tape, and archival tape (col. 10, lines 36-48).
The examiner argues that Garfinkle’s use of two levels of
storage indicates an acknowledgment of the tradeoff between
storage accessibility and cost, and that Craig teaches that it
was known to use several levels of storage hierarchy to optimize
the tradeoff between large size and low cost and small size and
high cost (answer, pages 6-7). The examiner argues that given
the disclosures of these tradeoffs, it would have been obvious to
one of ordinary skill in the art to provide a third data storage
unit as a caching unit for temporary storage of frequently
requested items in Garfinkle’s system (answer, pages 7-8). The
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