Data processing: structural design – modeling – simulation – and em – Simulating electronic device or electrical system – Computer or peripheral device
Reexamination Certificate
2007-10-02
2007-10-02
Knight, Anthony (Department: 2121)
Data processing: structural design, modeling, simulation, and em
Simulating electronic device or electrical system
Computer or peripheral device
C360S137000, C360S271000
Reexamination Certificate
active
09825267
ABSTRACT:
A helical scan drum design for use in non-tracking tape devices which assures 70% coverage of a track to be read by overscanning with at least two read heads at approximate 1X speed. The present invention further provides a simulation method for evaluating potential drum designs for such overscan applications. The preferred drum design uses pairs of read heads having identical azimuth angles and positioned on the rotating drum such that in combination they overlap the scan of a track by 130% the track width. These dimensions assure at least 70% coverage of each track by at least one of the pair of heads at up to 1X speed while assuring no overlap with another recorded track recorded along an identical azimuth angle. The simulation method allows for evaluation of potential drum designs by accepting parameters describing the intended drum application and then simulating track read operations over a plurality of simulated tracks to determine the efficacy of the design over a range of tape speeds and gap widths. Designs that simulate successful reading of a sufficient threshold number of tracks over a sufficiently broad range of tape speeds may then be selected for further test and evaluation.
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Blatchley Michael A.
Detro David L.
Dunn Paul
Costa Jessica
Knight Anthony
Law Office of Jessica Costa, P.C.
Stevens Thomas H.
Tandberg Data Corporation
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