Data overwriting in probe-based data storage devices

Details Data overwriting in probe-based data storage devices Data overwriting in probe-based data storage devices

2006-08-29

2006-08-29

Nguyen, Hoa T. (Department: 2656)

Dynamic information storage or retrieval

Binary pulse train information signal

Having specific code or form generation or regeneration...

C369S126000

Reexamination Certificate

active

07099257

ABSTRACT:
Methods are provided for overwriting data in a probe-based data storage device (1) wherein data is represented by the presence and absence of pits formed in a storage surface (4) by a probe of the device. Input data is first coded such that successive bits of a first value in the coded input data are separated by at least one bit of the other value. Overwrite data bits v0, v1, v2, . . . , are generated from the coded input data bits b0, b1, b2, . . . , and the overwrite data bits v0, v1, v2, . . . , are then used to overwrite data on the storage surface (4). According to a first method, the overwrite data bits are generated such that, if a pit represents a bit of said first value in the data storage device (1) then vi={overscore (b)}i−1, for i≧1 and v0has said first value, and if a pit represents a bit of said other value in the data storage device (1) then vi=bi−1for i≧1 and v0has said other value. According to a second method, the overwrite data bits are generated such that, if a pit represents a bit of said first value in the data storage device (1) then vi={overscore (b)}i−1({overscore (b)}i−2+bi) for i≧2, v0has said first value and v1={overscore (b)}0, and if a pit represents a bit of said other value in the data storage device (1) then vi={overscore (({overscore (b)}i−1({overscore (b)}i−2+bi)))} for i≧2, v0has said other value and v1=b0. With both methods, the result of the overwrite operation is to record either the coded input data b0, b1, b2, . . . , or its complement {overscore (b)}0, {overscore (b)}1, {overscore (b)}2, . . . , depending on whether a pit represents a bit having the first value or a bit having the other value. This result is independent of the bit values of the data which is overwritten.

REFERENCES:
patent: 5835477 (1998-11-01), Binnig et al.
patent: 6122010 (2000-09-01), Emelko
patent: 2002/0126595 (2002-09-01), Hogan

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