Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data in specific format
Reexamination Certificate
2005-09-27
2005-09-27
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data in specific format
C360S053000, C710S006000
Reexamination Certificate
active
06950257
ABSTRACT:
Backspacing over data to overwrite the data as recorded on magnetic tape is provided logically, rather than by causing a magnetic tape to drive to backhitch. The data is written to the magnetic tape as it was before it was logically changed in order to insure that the data is preserved on tape. Recovery of the data is from a succeeding data set which logically invalidates the original data by a superseding identifier. Control logic arranges data transactions for writing to magnetic tape as data sets; and, in response to backspace and overwrite commands, or when transactions are accumulated into a succeeding data set, rewrites the original transaction adjusted in accordance with the commands as a superseding data set downstream from the original transaction, logically invalidating the original transaction by setting a superseding identifier in the superseding data set(s).
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“Storage REC”, IBM Technical Disclosure Bulletin, Nov. 1982, p. 2880.
Greco Paul Merrill
Itagaki Hiroshi
Jaquette Glen Alan
Nagura Hironobu
Nakayama Hirokazu
Holcombe John H.
Hudspeth David
Mercedes Dismery
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