Appeal No. 1995-3501 Page 4
Application No. 07/927,788
directory group 140 includes a plurality of file directory
blocks (Specification at page 15). Each file directory block
contains a plurality of file directory entries. Each file
directory entry contains location information that points to a
data file (Specification at page 15).
The WORM volume 110 is complemented by the use of a
magnetic storage 240 which stores a PVR table (Specification
at page 7; Figure 3). The PVR table contains a PVR record for
each path (Specification at page 7). The PVR record buffers
file directory entries as new data files are written to the
WORM.
Therefore, when a user wishes to read a data file from
the WORM, there is no need to search the path directory group
or the file directory group on the WORM to locate the data
file if the file directory entry is still in the PVR table
(Specification at page 7). The PVR record also includes the
address of the next file directory group to be written and the
address of the previous file directory group. The
specification
refers to this storing of the address of the next and previous
file directory group as “chaining” and further discloses:
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Last modified: November 3, 2007