Data storage method and apparatus to detect if WORM data has...

Details Data storage method and apparatus to detect if WORM data has... Data storage method and apparatus to detect if WORM data has...

2007-10-09

2007-10-09

Wong, K. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S048000

Reexamination Certificate

active

11082614

ABSTRACT:
A method is provided of detecting if WORM data has been tampered with, the data having been recorded in a sequence of data sets. Each data set includes a write pass value and the write pass values are incremented at intervals in the sequence according to a predetermined rule providing that the write pass values are incremented each time a predetermined number of the data sets has occurred in the sequence. The data sets are read in sequence and the write pass value of each data set is compared with the write pass value of the preceding data set. An indication is made if the write pass value of any of the data sets differs from the write pass value of the preceding data set by an amount that breaches the predetermined rule.

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GB Search Report dated Jun. 9, 2004.

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