Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1991-04-22
1994-06-14
Dixon, Joseph L.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
395400, 395600, 369 59, 369 32, 364DIG1, 364DIG2, G06F 1200
Patent
active
053218248
ABSTRACT:
A write-once read-many (WORM) disk stores data in continuation chains. Each chain being arranged as a plurality of groups of contiguous datastoring areas (such as disk sectors, clusters of sectors, tracks and the like). The groups are separated on the disk. Each recorded area in the chain has a forward pointer to a next succeeding area of the chain, whether such succeeding area is in the same chain or in a next chain. A last succeeding one of the groups includes unrecorded allocated area(s) of the chain. To find the end of the chain, only the last area of each successive group is accessed and read until a last area of a last group is accessed with an indication that such last group area is unrecorded. Then the entire last group is scanned to find the last recorded area of the chain.
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Burke William D.
Day III Kenneth F.
Dewey Douglas W.
Dixon Joseph L.
International Business Machines - Corporation
Lane Jack A.
Somermeyer H. F.
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